Almost all amateur gardeners make this mistake when planting fruit trees.

If you plant an apple, cherry or apricot tree in March or April, you’re probably picturing scented blossom and baskets of home-grown fruit. Yet in many gardens the reality is the opposite: the tree sulks, barely puts on new growth, produces no flowers-and no one can work out what went wrong. Often the problem isn’t the tree at all, but a few crucial centimetres at planting time.

The most common planting trap: fruit trees set too deep

Well intentioned, badly executed

Many gardeners assume a tree should sit as deep and as firmly as possible. So the planting hole is dug generously, soil is banked up around the base of the trunk, and everything is tamped down hard. It sounds sensible-but for fruit trees it can be genuinely disastrous.

If you cover the trunk base and the graft union with soil, you are quite literally cutting off your fruit tree’s air supply.

When the sensitive area at the base of the tree is buried, oxygen exchange drops sharply, moisture lingers, and the trunk sits in permanently damp conditions. That is precisely the one zone the tree is not designed to tolerate.

Why damp soil against the trunk is so risky

Bark on the trunk behaves very differently from root tissue. Roots are built to cope with consistently moist soil. Trunk bark, on the other hand, reacts badly to being kept wet.

If soil is left piled against the trunk, several things tend to happen:

• the bark becomes waterlogged and swells,
• hidden damage develops in the covered wood,
• fungi and rot organisms gain entry,
• the channels that carry water and nutrients are damaged or destroyed.

From above ground the tree may look fine at first. But below the surface the trunk can begin to decay bit by bit. Shoots above the damaged section receive less and less “sap flow”, until the tree grows weakly-or fails altogether.

The make-or-break spot on the trunk: locating the graft union

How to identify the sensitive zones on a young fruit tree

Most nursery fruit trees are grafted. In other words, a tough rootstock (the lower part) is joined to a high-quality fruiting variety (the upper part). That join is usually easy to spot on the trunk.

Two areas matter most:

• Root collar (trunk base): the transition from roots to trunk-where root tissue ends and the true trunk begins.
• Graft union: a few centimetres above, often a bump, scar or slight kink in the wood-where the chosen variety was grafted on.

That “scar” is what produces the productive crown later on. It must never end up below soil level.

Why the graft union must stay clear of soil

The graft union is the heart of your fruit tree-if it disappears underground, the tree loses the advantages you paid for.

If the graft union is buried, the upper variety may start trying to form its own roots. That sounds helpful, but it usually undermines the point of grafting: you can lose the rootstock’s benefits such as improved frost hardiness, better disease resistance, and controlled vigour for smaller gardens.

Gardeners often refer to this as own-rooting (the tree effectively “breaks away” from the rootstock). Common consequences include:

• stronger, less manageable growth,
• noticeably delayed flower formation,
• reduced yields,
• increased susceptibility to disease.

Instead of investing energy in blossom and fruit buds, the tree is forced into survival mode-hardly the strong start you wanted.

How to plant fruit trees correctly in March

The golden rule for planting height

The key practical rule is this: after planting, the graft union must sit 5–10 cm above the finished soil level. The root collar should sit at, or just above, soil level-but it must not be buried.

Keep the trunk base clear and the graft union plainly visible-this is how fruit trees establish with real vigour.

This positioning keeps the sensitive area drier, with air and sunlight reaching the bark, rather than damp soil sitting against it. The tree can then put its spring energy into new growth and blossom rather than fighting stress.

A simple trick to prevent the tree sinking later

Freshly loosened soil is full of air and will settle noticeably after a few weeks. If you don’t plan for that, a correctly planted tree can end up too deep anyway.

A practical method:

1. Build a small, firm mound of soil in the bottom of the planting hole.
2. Spread the roots out like a fan over the mound.
3. Lay a straight stick or spade handle across the hole to mark the future soil level.
4. As you backfill, keep checking that the graft union remains 5–10 cm above that line.
5. Firm the soil gently so the tree stands stable, but don’t compact it rock-hard.

Done this way, the tree remains at the right height even after the ground settles-and stays correctly positioned for years.

Aftercare that helps without smothering the trunk (extra)

Once planted, water thoroughly to settle soil around the roots, then water as needed through the first growing season-especially in dry, windy spells. If you mulch to conserve moisture and suppress weeds, keep the mulch pulled back from the trunk so the root collar and graft union remain dry and visible. A clear ring of a few centimetres around the bark prevents the same “permanent damp” problem that deep planting causes.

How to spot a “buried alive” fruit tree

Warning signs in the first and second year

A fruit tree with a buried root collar doesn’t usually collapse overnight. The symptoms creep in, most noticeably in spring and early summer:

• short, weak new shoots,
• small, yellowish leaves,
• flower buds that dry out before opening,
• little visible growth for a long period, as if the tree is “paused”.

If the second year brings the same sparse growth and still no blossom, it’s worth checking right down at the base of the trunk. Often you’ll find the graft union has slipped below the surface or is tightly packed with soil.

Rescue job: uncover the trunk base

If the damage hasn’t gone too far, a fruit tree planted too deep can often be saved by carefully exposing the base.

With a light touch, you can frequently stabilise the situation:

1. Use your hands or a small hand trowel to gently remove soil from the trunk.
2. Form a shallow dish around the trunk so the root collar and graft union are visible and clear.
3. Take care not to tear fine roots or scratch the bark.
4. Reposition the watering basin a little further out so water doesn’t run directly onto the trunk.

Trees usually respond to the reduced stress with stronger growth and healthier leaf colour the following spring. Even so, it can take one or two years to return to a full flowering phase-patience is worthwhile.

Checklist: setting fruit trees up for a healthy start

Quick checks while backfilling the planting hole

A few straightforward rules prevent the most common mistakes. Use this checklist as you plant:

• Position the graft union clearly above the future soil line.
• Don’t press soil directly against the trunk; the bark should remain free.
• Shape the watering basin slightly away from the trunk so water cannot pool against the wood.
• Firm the soil only enough for stability-leave air space in the ground.
• In the first weeks, check whether the tree has settled and sunk.

Following these points lays the foundation for strong root development and a resilient crown.

What terms like “root collar” and “grafting” actually mean

A quick look at fruit tree “anatomy”

The root collar is the junction between roots and trunk-where underground and above-ground tissues meet. This area is especially sensitive to prolonged wetness, frost, and bark damage.

The graft union is created when a selected variety-say, a richly flavoured apple-is grafted onto a rootstock chosen for how well it copes with local soil, climate and diseases. Without grafting, many modern fruit varieties would be far less reliable in a home garden.

That is why the position of the graft scar relative to the soil surface matters so much. If you accidentally bury it, you strip away the very characteristics you chose the tree for.

Practical examples for different planting sites

Slopes, heavy soils and container growing

On sloping ground, water tends to run off more readily, so the risk of waterlogging is lower. Even there, the same rules apply: keep the trunk base clear and the graft union above soil level. In very heavy clay soils, adding organic matter and grit (or creating a simple drainage layer) helps excess water move away more quickly.

If you grow fruit trees in containers-such as columnar forms or trees on low-vigour rootstocks-you need to be even more precise. Pots can become waterlogged faster, so use a solid drainage layer (for example, crocks or coarse material at the base) and a high-quality, structure-stable compost mix. And stay disciplined: never top up compost over the root collar, even if the surface level drops a little over time.

Ultimately, success isn’t decided by variety alone. It also comes down to paying attention to those few, decisive centimetres on the trunk. Get them right, and spring won’t bring bare branches-it will bring blossom, followed by fruit you can actually pick and enjoy.