Laying the garden and planting

Site Selection: Where to Plant a Plum

The plum is a demanding but rewarding crop. For the tree to reward you with harvests, four main factors must be considered: light, wind protection, topography, and soil.

Light and warmth are the plum’s main allies. For good growth and fruit ripening, the tree needs at least 6–8 hours of direct sunlight per day (Buckingham 2010). In shade, the plum becomes leggy, sets flower buds less well, and the fruits lose sugar content. Therefore, choose the sunniest spot in your garden, preferably on the south or south‑west side.

Wind protection. The plum blooms early, sometimes as early as April, and at that time it is particularly vulnerable. Cold winds not only knock off blossoms but also hinder the work of pollinating bees. Ideally, the site should be sheltered from the north and north‑east by a wall, fence, or dense hedge. However, remember that the fence should not create a solid wall – it is important to ensure air circulation to avoid stagnation of cold air during spring frosts (Agustí 2010).

Topography and microclimate. The plum is sensitive to the stagnation of cold air. Low‑lying areas, enclosed hollows, and the foot of slopes are not the best choice. In such places, cold air accumulates at night, and the risk of flower damage by spring frosts increases many times over. The optimal location is the upper or middle part of a gentle slope (with a gradient of 3–5°), especially with southern, south‑western, or western exposure (Kurennoi 1985; Trunov and Samoshchenkov 2012). Such slopes warm up better, and cold air drains downwards without lingering around the trees.

Soil. Plums like deep, fertile, moisture‑retentive but well‑drained soils. The ideal is loamy and sandy‑loam soils with a neutral or slightly acidic reaction (pH 6.0–6.8). On heavy clay soils with water stagnation, roots suffer from oxygen deficiency, and trees often become diseased. On light sandy soils, on the contrary, moisture drains away quickly, and the plum suffers from drought. The groundwater level should be no higher than 1.5–2 metres – the roots should not reach the water, otherwise the root collar may become waterlogged (Kurennoi 1985).

What to avoid:

• Shaded areas and sites with northern exposure.
• Enclosed hollows and "cold pockets".
• Areas with a high groundwater table.
• Heavy, waterlogged clay soils.
• Places where plums have grown in the last 5–6 years (this is related to soil fatigue – the accumulation of toxins and pathogens specific to this crop in the soil) (Kurennoi 1985).

Planting Layout and Distances Between Trees

The distance between trees determines not only the convenience of care but also the health of each tree. In dense plantings, trees compete for light, water, and nutrients; the crowns are poorly ventilated, which promotes disease development, and the fruits become smaller. Too sparse planting leads to inefficient use of land and a reduction in the total yield per hectare.

What the distances depend on:

1. Rootstock vigour. On vigorous rootstocks, trees are larger and need more space. On dwarf and semi‑dwarf rootstocks, distances are reduced (Westwood 1993; Potapov et al. 2000).

2. Variety vigour. Some plum varieties are naturally more spreading and vigorous.

3. Crown shape. Freely growing trees with round crowns require larger intervals than flattened forms (palmette, spindle‑shaped crowns) (Agustí 2010).

Recommended planting schemes:

Sources: Westwood (1993); Trunov and Samoshchenkov (2012); Agustí (2010).

For the home garden, schemes of 5×3 m or 6×4 m are optimal. The first figure is the distance between rows, the second – between trees in the row. With such planting, the trees receive enough light and space for development, and the gardener has convenient access for cultivation and harvesting.

Important note: when planting on slopes, the rows should be laid across the slope, along the contour lines. This prevents soil erosion and ensures uniform moisture (Agustí 2010; Potapov et al. 2000).

Pollinators and Variety Compatibility

This is perhaps the most frequent source of disappointment for beginning gardeners. The tree blooms abundantly, but there are no fruits. Or there are, but very few. In most cases, the reason is the lack of a suitable pollinator.

Plum and self‑fertility. According to their pollination ability, plum varieties are divided into three groups (Buckingham 2010; Hessayon 1993):

• Self‑fertile (self‑compatible) – set fruit from their own pollen. They do not need a neighbour‑pollinator. Examples: 'Victoria', 'Tsar', 'Moskovskaya Vengerka', 'Renklod Kolkhozny', 'Stanley'.
• Partially self‑fertile – produce a small yield from self‑pollination, but for full fruiting they need a pollinator.
• Self‑sterile – do not set fruit at all without a pollinator. They need a neighbouring variety that blooms at the same time.

Rules for selecting pollinators (Buckingham 2010; Hessayon 1993):

1. The pollinator must bloom simultaneously with the main variety. Varieties are grouped by flowering time: early (group A), mid‑season (group B), and late (group C). The best pollination occurs between varieties of the same group, acceptable between neighbouring groups (A and B, B and C).

2. The distance between pollinating varieties should not exceed 30–50 metres. Ideally, they should grow close together – in the same row or through one row.

3. For reliability, it is recommended to plant at least two or three mutually pollinating varieties in the same orchard block.

4. Even self‑fertile varieties give higher yields when cross‑pollinated with another variety.

Compatibility table (example):

Practical organisation of pollination (Kurennoi 1985):

• In commercial orchards, pollinating varieties are planted in strips no wider than 50 m.
• In a home garden, it is sufficient to plant 2–3 trees of different varieties close to each other.
• To attract bees, it is useful to plant honey‑bearing plants nearby.

And remember: even with an ideal variety selection, the plum yield depends on the weather during flowering. A rainy and cold spring reduces bee activity, and there will be fewer fruit sets – that is normal.

In the next chapter we will discuss how to choose a quality seedling: what to pay attention to when buying, how rootstocks differ, and why the age of the seedling matters.

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Seedling Age: Which One to Choose

Nurseries sell seedlings of different ages. For establishing an orchard, one‑year‑old and two‑year‑old plants are optimal.

One‑year‑old seedlings – are plants grown from a grafted bud over one growing season. They have a single straight stem (central leader), often without side branches. Such seedlings tolerate transplanting more easily, adapt faster, and form a proper crown from scratch (Agustí 2010; Martin 2019). In the southern regions, planting orchards with one‑year‑old seedlings is common practice (Kurennoi 1985).

Two‑year‑old seedlings – are plants that have grown for another year after the first grafting. They already have 3–5 side branches (scaffold shoots) formed. They look more developed and begin to bear fruit a year or two earlier than one‑year‑olds. However, they adapt slightly less easily after transplanting because of their larger above‑ground part. In the middle zone and northern regions, two‑year‑old seedlings are often preferred because they are better prepared for winter (Potapov et al. 2000).

General rule: both one‑year‑old and two‑year‑old seedlings are suitable for a home orchard. The main thing is that they are healthy and have a well‑developed root system. The age of the seedling is always indicated on the label or stated at the time of purchase.

Rootstocks: What Lies Beneath the Ground

Most plum varieties are propagated by grafting onto a special rootstock – the plant that provides the root system. It is the rootstock that determines how large the tree will grow, how soon it will bear fruit, and how it will tolerate drought and frost. It is the "foundation" of the fruit tree, as I.V. Michurin figuratively put it (Kurennoi 1985).

Main types of plum rootstocks:

Sources: Krivko (2014); Westwood (1993); Kurennoi (1985).

What is important for the home gardener to know:

1. Vigorous rootstocks (seedlings of myrobalan, wild plum, sloe) – the most reliable option for most regions. The trees grow large, but they are resistant to drought, frost, and diseases, and are long‑lived. Ideal for non‑irrigated sites and regions with harsh winters (Kurennoi 1985).

2. Semi‑vigorous and semi‑dwarf clonal rootstocks – the best choice for small orchards. Trees are more compact, come into bearing earlier (in the 3rd‑4th year), and are easier to care for. However, they are more sensitive to moisture deficiency and soil fertility (Trunov and Samoshchenkov 2012).

3. Dwarf rootstocks – for intensive gardening and small plots. Trees begin to bear fruit in the 2nd‑3rd year, are convenient to protect from frost and to harvest. But they require supports (stakes or trellises), regular irrigation, and good nutrition. In regions with frosty, snowless winters, the roots may freeze (Potapov et al. 2000).

Compatibility of rootstock and scion. Not all plum varieties graft equally well onto a particular rootstock. For example, most plum, apricot, and peach varieties are well compatible with rootstock VVA‑1 (Krivko 2014). When buying, it is better to choose seedlings grown in local nurseries – they have selected variety‑rootstock combinations proven for your region.

Open‑Root and Container‑Grown Plants

Seedlings are sold in two ways: with bare roots (open‑root system, ORS) and with a closed root system (CRS, containerised).

Bare‑root seedlings are plants dug from the nursery soil with their roots free of earth. They are sold during the dormant period: in autumn (after leaf fall) and early spring (before bud break). Advantages: lower price, wide availability, and the ability to see and assess the condition of the roots. Disadvantages: roots dry out easily, require quick planting (preferably within 1–2 days), and the planting window is limited. Such seedlings establish better if planted immediately, and the roots are soaked in water before planting (Martin 2019).

Container‑grown seedlings are plants raised in containers (pots, bags with substrate). The roots are in a soil ball. They can be planted practically at any time of year (except hot summer months). Advantages: roots are not damaged during transplanting, survival rate is close to 100%, and you can buy and plant at a convenient time. Disadvantages: higher price; you need to check whether the seedling has become pot‑bound (roots should not encircle the entire ball and emerge from drainage holes – that is a sign that the plant has "suffocated" in its tight space) (Martin 2019; Krivko 2014).

For the home orchard both options are good. If you plan to plant in spring or autumn, take a bare‑root seedling – it is reliable and inexpensive. If you want to plant in summer or are unsure of your skills, choose container‑grown.

Signs of a Quality Seedling

How do you recognise a healthy and promising seedling at purchase? Pay attention to the following details (Martin 2019; Hessayon 1993; Cornell Guide 2003):

1. Root system (for ORS):

• Roots should be moist, elastic, not brittle, without signs of rot or mould.
• At least 3–5 main (scaffold) roots at least 25–30 cm long, evenly spread in all directions.
• Roots densely covered with fine absorbing rootlets (fibrous roots). If fine rootlets are few, survival will be poorer.
• Root cuts – light, without darkening. Dark, dried, or peeling bark on roots indicates damage or desiccation.

2. Above‑ground part:

• The stem is straight, without bends or mechanical damage.
• Bark smooth, without cracks, frost cracks, or signs of disease (gum exudation, spots, growths).
• Stem diameter at 5–10 cm above the graft union – at least 10–15 mm for one‑year‑olds and 15–20 mm for two‑year‑olds.
• Buds on the stem and branches are alive, firm, not dry. When cut, the bud should be green.
• For a two‑year‑old: 3–5 well‑developed side branches at least 40 cm long, with wide angles of attachment to the stem (not less than 45–60°). Narrow angles (less than 45°) are weak points that may break under the weight of the crop (Westwood 1993).

3. Graft union:

• A clearly visible thickened "scar" or bend at 10–15 cm above the root collar – the junction of scion and rootstock.
• The union should be tight, without cracks, overgrowths, or signs of incompatibility.
• This spot is particularly vulnerable, so it must be intact and healthy.

4. General condition:

• The seedling should have a balanced top and root system: the roots should not be noticeably weaker than the branches (or vice versa).
• No signs of pests (aphids, scale insects) or diseases.
• The seedling should be of a true‑to‑type variety – the label or tag should indicate the variety, rootstock, age, and category.

Advice: when buying, choose seedlings from local nurseries or well‑established garden centres. Plants grown in your climate are better adapted to local conditions (Hessayon 1993). Avoid seedlings with signs of drying, roots wrapped in plastic without air access, or with unclear labels.

In the next chapter we will look at when it is better to plant plums – in spring or autumn, depending on the climatic zone, and how to choose the optimal timing for your region.

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Spring and Autumn Planting: Pros and Cons

Autumn planting has traditionally been considered preferable for plums in southern regions and areas with mild winters (Agustí 2010; Kurennoi 1985). What are its advantages?

• Roots grow even in autumn. In plums, as in other fruit trees, the growth of absorbing roots continues at soil temperatures above +2…+4 °C. If you plant a seedling in autumn, it will have time to root before frost and in spring will start growing significantly earlier and more vigorously than a spring‑planted seedling that is only beginning to settle in (Westwood 1993).
• Spring moisture. In autumn, the soil is still warm and moist, which promotes rapid root recovery. In spring, meltwater also provides good moisture.
• Less work in spring. Autumn planting relieves the busy spring period when many other tasks need to be done.

Disadvantages of autumn planting:

• The seedling must manage to root before severe frosts. If winter comes early and abruptly, the unhardened roots may freeze.
• In regions with harsh, low‑snow winters, there is a risk of the above‑ground part and roots freezing.
• Young trees need protection from frost and rodents (covering, earthing up).

Spring planting is the main choice for the middle zone, northern regions, and areas with cold winters (Hessayon 1993; Cornell Guide 2003). Why?

• Safety. The seedling is not exposed to winter stress. It manages to establish and grow roots during the warm period and goes into the next winter already strengthened.
• Ease of care. It is easier to water and monitor the young tree during the growing season.

Disadvantages of spring planting:

• The planting window is very short – you must plant before bud break. A delay of 1–2 weeks drastically reduces survival.
• In spring, the soil is often waterlogged, and planting in mud can lead to soil compaction and poor root aeration.
• The seedling must be bought and delivered exactly on time, which is not always convenient.

Optimal Timing by Region

Planting dates depend directly on the climatic zone. We can roughly distinguish three groups of regions (based on data from Kurennoi 1985; Potapov et al. 2000; Westwood 1993):

Southern regions (North Caucasus, Crimea, Krasnodar Krai, southern Ukraine, Moldova, subtropics):

• Preference – autumn planting. Optimal dates: from mid‑October to mid‑December, while the soil has not frozen. In warm winters, planting is even possible in January‑February if there is a thaw and the ground is not frozen.
• Spring planting is also possible, but it starts early – as soon as the soil thaws (usually March). However, in spring in southern regions there is often a rapid drought, and seedlings may suffer from lack of moisture. Thus autumn is the clear favourite.
• For container‑grown seedlings, the dates are not critical – they can be planted throughout the growing season, except for the hottest months (July–August).

Middle zone (Central Russia, Volga region, Black Earth region, Belarus, northern Ukraine, temperate Europe):

• Both spring and autumn planting are used here, but with regard to specific weather conditions.
• Autumn planting is possible, but only for the most winter‑hardy plum varieties (e.g., 'Moskovskaya Vengerka', 'Skorospelka Krasnaya') and on well‑drained soils. Plant 20–30 days before the onset of persistent frosts, usually in late September – the first half of October.
• Spring planting is the more reliable option. Plant immediately after the soil thaws, when it warms up to +5…+8 °C and is no longer "sticky" (in the middle zone this is usually late April – early May). Delay in spring planting is highly undesirable – the seedling must have time to root before active vegetation begins.

Northern regions (Urals, Siberia, Far East, northern areas of European Russia, zones with harsh winters):

• Only spring planting is recommended (Kurennoi 1985; Potapov et al. 2000). Seedlings are planted in late April – early May, after the soil thaws and warms up.
• Autumn planting in these regions is extremely risky: early and severe frosts can kill a plant that has not yet rooted. Moreover, winters are often low‑snow, which increases the risk of freezing of the root system.
• For particularly cold regions, special winter‑hardy varieties and rootstocks are used, and planting on raised beds or on southern slopes is practiced for better warming.

Practical Recommendations

1. Base your timing on the weather, not just the calendar. The soil should be warm enough and not overly wet. To check: take a handful of soil and squeeze it – if it crumbles rather than turning into a muddy clod, you can plant. If the soil sticks to the tool, it is better to wait.

2. For bare‑root seedlings – only during dormancy. Plant when the tree is leafless and buds have not started to swell (in spring) or leaves have already fallen (in autumn). If a bare‑root seedling is bought in advance, it should be stored in a cool place with moist roots, heeled in or wrapped in damp cloth and plastic.

3. Container‑grown seedlings can be planted almost any time, but it is best to avoid the hottest and driest months (July–August), when even container plants find it hard to adapt.

4. If you are late with autumn planting. If you have bought a seedling too late in autumn and frosts are approaching, it is better not to risk it but to heel the seedling in a slanted position in a protected place and cover it with spruce branches or snow, and plant it in spring (Martin 2019; Hessayon 1993).

5. Preparing the planting hole. If you plan spring planting, it is better to prepare the planting hole in autumn – over winter the soil will settle and the added fertilisers will "mature". For autumn planting, the hole is prepared 2–3 weeks before planting so that the soil settles (Martin 2019; Agustí 2010).

Final advice: for novice gardeners in the middle zone and further north, it is safer to choose spring planting. If you live in the south and can provide irrigation, plant in autumn – it will give a whole year's head start in growth. In any case, the main thing is not to delay spring planting and not to be late in autumn, and also to prepare the planting site properly, which we will cover in the next chapter.

Next chapter: preparation of the planting hole – size, fertiliser application, and typical mistakes.

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Dimensions of the Planting Hole

The size of the hole should allow the roots to be placed freely without bending or twisting. Too narrow a hole – and the roots become deformed, slowing growth. Too shallow – and the roots end up in a dense, uncultivated layer.

Recommended dimensions:

• For plums on vigorous and semi‑vigorous rootstocks: diameter 80–100 cm, depth 50–60 cm.
• For plums on semi‑dwarf and dwarf rootstocks: diameter 60–80 cm, depth 40–50 cm.
• On poor, sandy, or heavy clay soils make the hole wider (up to 100–120 cm) and deeper (up to 70–80 cm) in order to replace or improve a larger volume of soil (Kurennoi 1985; Martin 2019).

The main rule: the roots should fit freely in the hole, naturally spread out. If during a trial placement the roots bend or press against the walls – the hole should be widened. A common mistake is a hole that is "deep but narrow" (like a bucket), in which the roots are bunched up and cannot develop properly (Agustí 2010).

Filling the Hole: What and How

The fertility of the topsoil in the first 3–5 years is critically important for the young tree. Fertilizers and organic matter are applied precisely into the planting hole to create a "nutrient depot" accessible to the roots from day one. However, it is important to do this correctly so as not to burn young roots.

Sequence of filling the hole:

1. The topsoil (humus‑rich, fertile, usually darker) is set aside in a separate pile. The lower, subsoil layer – in another pile (it is better not to use it for the root zone).

2. Prepare the planting mix. Standard recipe (Agustí 2010; Hessayon 1993):

• To 1 part of the fertile topsoil, add 1 part of well‑rotted manure or mature compost (not fresh!).
• Add 2–3 handfuls (about 100–150 g) of superphosphate, 50–80 g of potassium sulphate (or potassium salt) – this will provide phosphorus and potassium for the first years.
• On acidic soils (pH below 5.5), add dolomite flour or hydrated lime – 200–400 g per hole, but mix thoroughly with the soil (Kurennoi 1985).
• Mix the mixture thoroughly. Fresh manure and nitrogen fertilisers (urea, ammonium nitrate) should not be added to the planting hole – they burn young roots and promote excessive shoot growth at the expense of roots.

3. Filling the hole. Put part of the mixture at the bottom in a mound – the seedling will be placed on it, spreading the roots over the slopes of the mound. This ensures even root distribution and good soil contact.

4. If the soil on the site is heavy clay, a drainage layer (broken brick, coarse gravel) 10–15 cm thick can be placed at the bottom of the hole – this will prevent water stagnation in the root zone (Cornell Guide 2003).

5. When planting after deep ploughing (when the entire area has been dug to a depth of 40–60 cm and fertilised), the filling of the hole itself can be minimal – it is enough to use only the topsoil without additional fertilisers (Kurennoi 1985).

Alternative approach (for rapid growth): some agronomists recommend a so‑called "perennial hole" – widened to 3–5 m in width and filled with a mixture of soil and compost in a 60:40 ratio (Martin 2019). This method speeds up tree growth in the first years, but requires significant labour. For a home garden, a standard hole with good filling is sufficient.

Typical Mistakes When Preparing the Hole

1. The hole is dug immediately before planting. The soil does not have time to settle, and after planting, especially on loose, freshly dug ground, the trees sink deeper than planned. It is optimal to prepare the hole 2–3 weeks before planting (or in autumn for spring planting). During this time, the earth compacts, and the root collar ends up at the correct depth (Martin 2019; Hessayon 1993).

2. Excessive organic matter application. If too much unrotted manure or even humus is added to the hole, in the first years the roots will develop "in comfort" and will not strive to penetrate the surrounding, less fertile soil. Later, when the organic matter in the hole is exhausted, the tree experiences stress. Therefore, the optimal ratio is 1:1 soil and organic matter, no more (Agustí 2010).

3. Adding nitrogen fertilisers at planting. Urea, ammonium nitrate, and other fast‑acting nitrogen forms can burn the delicate absorbing roots. Nitrogen should be given only as top‑dressings starting from the second‑third year after planting, or carefully applied in spring by scattering on the surface and working into the soil (around the crown projection), but not into the planting hole (Westwood 1993).

4. The hole is too deep. If the seedling is planted so that the root collar is 10–15 cm below the soil surface, this can lead to bark rotting, fungal diseases, and even the death of the tree. The depth of the hole should be such that after the soil settles the root collar is at the surface level (more detail in the planting chapter) (Agustí 2010).

5. Poor mixing of fertilisers with soil. If fertilisers are placed in layers, the roots may not reach them, or conversely may end up in a local zone of high salt concentration. All additives should be thoroughly mixed throughout the soil mixture.

6. Neglecting drainage on heavy soils. Even in a properly filled hole on clay, water can accumulate during a rainy season. Plum trees do not tolerate this. If the site has a high water table or heavy clay, it is better to raise the planting site by 20–30 cm by making a mound, or to dig a wider and shallower hole with a drainage layer (Tarasov 1981).

Useful practical tip: before planting, check the depth of the hole by placing a planting board or a straight lath across the hole. It will indicate the level of the true soil surface. By referencing it, you can always accurately determine at what depth the root collar should be and avoid burying it (Martin 2019).

In the next chapter we will move on to the most critical stage – the planting technique: how to prepare the roots, adjust the depth, stake, water, and mulch the seedling.

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Root System Preparation

The roots are the most vulnerable organ of the seedling during transplanting. Their task is to quickly re‑establish contact with the new soil and begin absorbing water and nutrients. Proper root preparation is critical.

For a bare‑root seedling:

1. Inspection and pruning. A few hours before planting, inspect the roots. Remove all damaged, dried, rotting, or bark‑stripped parts. Make a fresh cut at the ends of healthy roots – this stimulates the formation of new absorbing rootlets (callus and active root tips) (Agustí 2010; Kurennoi 1985). Root pruning should be done with sharp secateurs, the cut should be smooth.

2. Soaking. If the roots appear dry, immerse them in water for 2–6 hours (no more than 12 hours to prevent rotting). You can add a root‑formation stimulator (heteroauxin, root‑hormone powder) according to the instructions. Soaking restores root turgor and increases their absorbing capacity (Martin 2019).

3. Clay slurry (clay‑manure mash). Before planting, dip the roots in a thick mixture of clay and water (you can add a little well‑rotted manure or cow dung). This technique protects the roots from drying out during planting, improves soil contact, and provides additional nutrition. Important: the slurry should be the consistency of thick sour cream. Too much manure in the slurry can cause burns, so use it moderately (Kurennoi 1985; Trunov and Samoshchenkov 2012).

4. Mycorrhizal treatment. Recently, powdered mycorrhizal fungi preparations (e.g., "Mycorrhiza") are increasingly used, applied to the roots before planting. These fungi help roots absorb phosphorus and other elements, protect against pathogens, and improve growth. If available, it is worth using (Martin 2019).

For a container‑grown seedling:

• Inspect the root ball. If the roots have encircled the entire substrate and formed a dense "felt", gently tease them apart at the bottom of the ball and make 2–3 shallow cuts to stimulate new roots to grow outward.
• Before planting, water the container well so that the root ball is moist and does not crumble.

Correct Planting Depth and Root Collar Position

This is the most important and most frequently violated point. The planting depth of the plum directly affects its health, longevity, and even the timing of bearing.

What is the root collar? It is the point of transition from the stem to the root system, usually noticeable by a change in bark colour and stem structure (where the roots end and the stem begins). On grafted seedlings, the root collar is above the graft union. Do not confuse the root collar with the graft union – the graft union is always higher (by 5–15 cm).

The golden rule: the root collar should be at soil level or 2–3 cm above it (after the soil settles). If it ends up even 2–3 cm below the soil surface:

• The bark begins to rot at the point of contact with wet soil – this is a direct path to fungal diseases and death.
• On a grafted tree, above the graft union, adventitious roots may form (on the scion itself). This leads to loss of dwarfing (the tree switches to its own roots and becomes as vigorous as on a seedling rootstock), delayed fruiting, and reduced yield (Agustí 2010; Martin 2019).

If the root collar is much higher than the soil level (more than 5–7 cm):

• Roots dry out in hot weather, water supply worsens.
• In winter, roots are in a colder layer, increasing the risk of freezing.
• The tree anchors poorly in the soil and may lean in the wind.

How to control planting depth:

• Use a planting board (a straight lath slightly wider than the hole) placed across the hole. It indicates the level of the true soil surface. By referencing it, determine at what depth the root collar should be (Martin 2019; Hessayon 1993).
• When backfilling the hole, periodically check the position of the root collar relative to the planting board.
• Remember that after watering and soil settling, the hole "sinks" by 2–5 cm, especially on loose, freshly dug soil. Therefore, leave the root collar 2–3 cm above the soil level when planting, so that after settling it ends up at the correct height (Agustí 2010).

For dwarf rootstocks: it is recommended to keep the graft union 3–5 cm above the soil level to prevent the formation of adventitious roots on the scion. On semi‑dwarf and vigorous rootstocks this is less critical, but still important (Trunov and Samoshchenkov 2012).

Planting Technique: Step‑by‑Step

1. Place the seedling. The planting stake (if needed) should be driven in before planting, on the north side of the seedling. Place the seedling in the centre of the hole on the mound, spread the roots over the slopes of the mound – they should lie naturally, without bends (Agustí 2010; Kurennoi 1985).

2. Backfilling. Fill the hole with the prepared soil mixture (mix of fertile soil, compost, and fertilisers). Periodically shake the seedling by the stem so that the soil fills all voids between the roots. Then lightly compact the soil with your feet (but not too hard – do not turn the soil into concrete).

3. Depth check. After filling half the hole, check the position of the root collar again. Adjust if necessary. Then add the remaining soil and compact again.

4. Forming a watering basin (berm). Around the tree, make an earth ridge 60–80 cm in diameter so that water does not run off to the sides during irrigation but is retained in the root zone. The height of the ridge – 10–15 cm (Agustí 2010).

Staking (Tying to the Stake)

Young plum seedlings, especially on weak‑growing rootstocks, are unstable and need support (Kurennoi 1985; Trunov and Samoshchenkov 2012). The stake protects the tree from wind, prevents root system rocking, and promotes faster establishment.

Staking rules:

• Drive the stake in on the south side of the trunk (to shade the stem from the sun and protect it from sunburn) or on the north side (against the wind). Drive it to a depth of 40–50 cm, to a height of 1.2–1.5 m (Agustí 2010).
• Tie the seedling to the stake with a figure‑eight knot (twine is looped around the stake and the trunk in a figure‑eight pattern) to avoid constriction of the trunk as it thickens. Use soft material (special garden tapes, strips of fabric, not wire or stiff twine).
• Check the tie once a year – does it cut into the bark? A constricting material can cause infection, weakening, and lodging of the tree.
• The support can be removed after 3–5 years, when the tree is firmly rooted.

For dwarf rootstocks (and especially for trellis forms) the stake or wire support must remain for the entire life of the tree (Agustí 2010).

First Watering

Even if the soil is moist, immediately after planting the tree should be watered abundantly to ensure good soil‑root contact and to eliminate air pockets (Westwood 1993).

Watering rate: 20–30 litres of water per tree (2–3 buckets). Pour the water into the root zone slowly so that it soaks into the root area (Hessayon 1993; Cornell Guide 2003).

Why water abundantly at planting?

• It compacts the soil around the roots, ensuring good contact.
• Removes air voids, in which roots cannot develop.
• Saturates the root zone with moisture, stimulating the growth of new absorbing rootlets.

Important: after watering, the soil will settle, and the root collar may end up at the correct level (if you planted slightly higher). If it has nevertheless sunk, carefully lift the seedling and add soil under the roots.

Mulching

Mulching is covering the root zone with a layer of organic material. This practice offers many advantages (Agustí 2010; Cornell Guide 2003):

• Prevents moisture evaporation from the soil, especially in hot weather.
• Suppresses weed growth, which competes with the young tree for water and nutrients.
• As it decomposes, organic matter improves soil structure and gradually feeds the tree.
• Protects roots from sharp temperature fluctuations.

What to use for mulch: well‑rotted manure, compost, peat, humus, dry grass without seeds, straw, pine or aspen bark, wood chips (not fresh – they may tie up nitrogen). Do not use fresh sawdust or fresh manure – they can burn roots and deplete the soil.

How to mulch:

• Layer of mulch 5–10 cm thick, at least (Cornell Guide 2003).
• Leave a gap of 5–10 cm from the trunk – mulch should not touch the trunk directly, otherwise it can cause bark rot and fungal diseases.
• Mulch over the entire root zone (diameter 60–80 cm).

In the first year after planting, mulch can be renewed as it decomposes (about once a season). In winter, in regions with harsh winters, mulch also serves a protective function – insulating the root collar.

Final planting checklist:

1. Root collar at soil level (or 2–3 cm above after settling).

2. Roots spread out, hole backfilled firmly.

3. Watering basin formed.

4. Staking done with soft material in a figure‑eight.

5. Abundant watering (20–30 l).

6. Mulch layer 5–10 cm, with a gap from the trunk.

In the next chapter – how to care for the young tree immediately after planting: monitoring establishment, further watering, and protection from diseases, pests, and rodents.

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Monitoring Establishment

Throughout the first growing season, it is important to regularly observe the condition of the seedling. This will allow you to notice problems in time and take action.

Signs of successful establishment:

• Within 2–3 weeks after planting, the buds begin to swell and open – this is the first and main sign that the roots are working and supplying the above‑ground part with water.
• Shoots grow actively, leaves acquire a healthy green colour, without signs of wilting.
• The seedling does not lean, does not wobble in the ground (if it wobbles, the roots have not yet anchored, and the tree may dry out or be damaged by wind).

Signs of problems:

• Buds do not open, leaves appear late, small, pale or yellowish.
• Leaves wilt even with sufficient watering – this may indicate root damage, incorrect planting depth (root collar buried or, conversely, exposed), or poor root‑soil contact.
• The seedling "rocks" in the ground – the root system is poorly anchored.

What to do if the seedling establishes poorly:

• Check soil moisture and adjust watering if necessary (more below).
• Inspect the root collar – is it buried or rotting? If it has sunk into the ground, carefully scrape away excess soil.
• Make sure the root zone is not waterlogged or compacted. If necessary, loosen the surface layer (3–5 cm deep), taking care not to damage the roots.
• If the seedling is damaged by diseases or pests, treat with appropriate preparations (see the "Protection" section below).

Additional advice: in the first year after planting, all flowers that appear are often removed. This allows the tree to channel all its energy into rooting and growth, rather than fruiting. In the first 2–3 years, the main task is to form a healthy crown and root system, not to obtain a harvest (Hessayon 1993; Martin 2019).

Watering in the First Year

Regular and correct watering is the most important element of care for a young seedling. After planting, the root system is still weak and shallow, so it is very sensitive to drying of the topsoil.

General principles of watering a young plum:

1. Frequency. In the first year, water the seedling more often than a mature tree, but in smaller amounts. In dry weather – about once every 7–10 days. In rainy weather, increase the interval. The soil in the root zone should not dry out deeper than 5 cm.

2. Rate. About 20–30 litres of water per tree (2–3 buckets). It is important that water penetrates to a depth of 30–40 cm – this is where the active roots are located. Water not at the trunk but in the root zone, but no closer than 10–15 cm to the trunk.

3. Time. It is better to water in the morning or evening to reduce evaporation and allow the moisture to soak in. Watering on a hot sunny day is inefficient – most of the water will evaporate, and drops on leaves can cause burns.

4. Method. It is best to use drip irrigation or water into the root zone. Do not pour water directly onto the trunk, especially with a strong hose jet – it can wash away the root collar and soil. For young trees with open roots, watering along the edge of the planting hole, where the bulk of the roots are concentrated, is particularly important.

5. Special considerations. If the mulch retains moisture well, you can reduce watering, but be sure to check moisture by moving the mulch aside in several places.

How to determine if watering is needed: push a stick into the soil to a depth of 10–15 cm. If it comes out dry – watering is needed. If wet – wait 1–2 days. On heavy clay soils, watering should be less frequent but more abundant. On light sandy soils – more often and in smaller amounts.

The first month after planting is the most critical. The roots are only just beginning to recover, and even a short break in watering can cause them to die back. Therefore, in the first 4–6 weeks, be sure to monitor soil moisture. In hot weather, you can water even every 3–4 days. After the tree starts growing (new shoots and leaves appear), watering can be slightly reduced, but it must still remain regular throughout the first season.

Pre‑winter moisture‑charging watering in autumn. If the summer was dry, 2–3 weeks before the onset of cold weather (in the middle zone – October), carry out an abundant autumn watering – 40–50 litres of water per young tree. This helps flush the soil and provides a reserve of moisture for winter, preventing winter desiccation of the roots (Westwood 1993; Agustí 2010).

Protection of the Young Tree

Young plums are more vulnerable than mature ones. They are threatened by frost, rodents, pests, and diseases. Comprehensive protection is the key to healthy development in the first years.

Protection from frost and sunburn:

• Whitewashing the trunk. In autumn or early spring, before bud swelling, whitewash the trunk and bases of scaffold branches with a lime solution (can be with clay and copper sulphate). Whitewash reflects sunlight, protecting the bark from overheating and sunburn (burns on the south‑west side in February–March are especially dangerous), and also partially repels pests. For young trees, use a weaker solution (less lime) so as not to burn the tender bark (Kurennoi 1985; Hessayon 1993).
• Winter trunk wrapping. In regions with harsh winters, wrap the trunk and the lower part of the branches with non‑woven fabric (white spunbond, burlap), spruce branches, or other breathable materials – this protects against frost cracks and desiccation. It is important that the covering does not trap moisture and does not prevent ventilation, otherwise the bark may rot.
• Bending branches. In very cold regions (Siberia, Urals), plums are grown in a creeping form or scaffold branches are bent to the ground for winter so that they are covered by snow – a reliable insulator (Kurennoi 1985).

Protection from rodents (hares, voles):

• Trunk wrapping. The most reliable method is to wrap the trunk to a height of 50–80 cm with special mesh, fine‑mesh metal netting, or a plastic protective sleeve. You can also use improvised materials: spruce branches, thick cardboard, reeds, roofing felt. Do not use plastic film – under it the bark rots and the tree may die.
• Chemical and mechanical means. In autumn, lay out poisoned baits for mice. Remove weeds and debris around the trunk that serve as shelter for rodents.
• Protection from hares. If hares are present in your area, cover the trunk for the whole winter, and in spring be sure to remove the covering so that moisture does not accumulate underneath and cause rot (Kurennoi 1985; Hessayon 1993).

Protection from diseases and pests:

• Preventive treatments. Early in spring, before bud break (at the "green cone" stage), treat the trees with 3% Bordeaux mixture or copper sulphate against fungal diseases (clusterosporiosis, coccomycosis, moniliosis) (Agustí 2010; Westwood 1993). This measure is especially important for plums, which are prone to fungal infections.
• Regular inspection. Throughout the season, inspect leaves and shoots. At the first signs of disease (spots, rot, growths) or pests (aphids, sawfly, codling moth), use appropriate approved preparations (insecticides, fungicides) strictly according to the instructions.
• Sanitary pruning. Remove dry, damaged, diseased branches. This not only heals the tree but also prevents the spread of infection.

Additional measures:

• Weed control in the root zone. Weeds steal moisture and nutrients from the tree. In the first year, keep the root zone clean by regular weeding or mulching.
• Protection from mechanical damage. Avoid wounding the trunk with a lawnmower, trimmer, or tools when cultivating the soil. Even small wounds can become entry points for infection.

Summary care plan for the first year:

Conclusion: Caring for a young seedling is an investment that pays off many times over. In the first year, it requires more attention than a mature tree. But if you create the right conditions at this stage, the tree will establish quickly, develop a strong root system and a healthy crown, and within a few years will begin to reward you with abundant and high‑quality harvests.