Why an apple tree earns its place

Few things repay a modest garden quite as generously as an apple tree. It gives you blossom in April, when little else is brave enough to flower; dappled shade in July, when you want somewhere to sit; and a crop in autumn that tastes of the actual sun rather than a supermarket chiller. It also anchors a border, gives height without bullying its neighbours, and gets better with every year you keep it.

The catch is size. Left to its own devices, an apple tree will happily reach eight metres and turn your vegetable bed into a shaded corner. The whole business of planting one in a small garden is therefore about controlling vigour — and that begins with the rootstock, not the variety.

Choosing a rootstock and a variety

The rootstock is the bottom half of the tree, and it determines how large the top half will eventually grow. For a small garden or a large pot, look for M27 (very dwarfing, roughly 1.2–1.5m) or M9 (dwarfing, around 1.8–2.4m). Both are perfect for cordons, stepovers and espaliers, though M9 in particular will need permanent staking because its roots are too weak to hold the tree upright on their own.

M26 is the best all-rounder for a small orchard on decent soil, settling at about 2.4–3m, while MM106 (3–4m) suits a larger plot or poorer ground. Avoid anything more vigorous unless you genuinely have room to spare.

Pollination matters just as much. Most apples are not self-fertile, so you need a compatible partner flowering in the same period — check the pollination group of any variety before you buy. Triploids such as Bramley's Seedling are the awkward ones, since they need two other trees rather than one. Reliable, self-fertile or partially self-fertile choices for small gardens include:

• 'Katy' — self-fertile, heavy crops of crisp red fruit
• 'Discovery' — early, sharp and flushed red, and a good pollinator
• 'Sunset' — Cox-like flavour but far easier to grow
• 'Egremont Russet' — nutty, keeps well, partially self-fertile
• 'Fiesta' — dependable cropper with a rich, aromatic taste
• 'Ashmead's Kernel' — a heritage russet that stores until spring

Where to plant and how to prepare the ground

Apples want sun — six hours a day or more — and shelter from the worst of the wind without being stifled. Avoid frost pockets at the bottom of a slope, where blossom can be blackened in late May, and avoid anywhere that sits wet in winter, as apples detest waterlogged roots.

Prepare the ground a fortnight ahead if you can. Clear perennial weeds, particularly couch and bindweed, then fork over the planting area rather than just the hole itself — roots will travel much further than most people expect. If your soil is heavy clay, work in plenty of well-rotted compost and grit; on light sand, compost alone will help hold moisture.

Planting, staking and supporting the tree

Bare-root trees go in between November and March while dormant, which is cheaper and establishes better. Container-grown trees can be planted at almost any time, though autumn and early spring are kindest.

• Stand bare roots in a bucket of water for an hour before planting.
• Dig a hole twice the width of the root spread, and no deeper than the roots actually need.
• Drive the stake in before planting to avoid spearing the roots — a 1.2–1.5m square stake for dwarfing rootstocks, set vertically, or angled at 45 degrees into the prevailing wind for larger trees.
• Position the tree so the nursery soil mark sits level with the surrounding ground. Planting too deep is the single commonest cause of failure.
• Backfill in layers, firming each with your heel, then water thoroughly — a full watering can, slowly, so it soaks rather than runs off.
• Tie the trunk to the stake with a proper adjustable tree tie and spacer, forming a figure of eight so nothing rubs.
• Mulch with 5–8cm of well-rotted compost in a ring 60–90cm across, keeping it clear of the trunk by a hand's width.

The first few years of care

Water young trees properly for their first two summers — around 10–20 litres a week in dry spells — and keep grass and weeds well away from the trunk, as competition at this stage costs you years of growth.

Thin the fruit in late June, leaving one apple every 10–15cm. It feels brutal, but it prevents biennial cropping and gives you larger, better fruit. Prune bush trees in winter to build an open, goblet-shaped framework, and summer-prune restricted forms such as cordons and espaliers in late August to keep them tidy and fruiting. Feed in February with a balanced fertiliser, then a potash-rich one in early summer. Check ties each spring and loosen them as the trunk swells, and fit a spiral guard against rabbits if you are in the countryside.

Making a small orchard work

Space trees 2.5–3.5m apart for M26 and a little more for MM106, allowing for the mature spread rather than the sapling you carry home. Three trees — an early, a mid-season and a late keeper, chosen from the same or adjacent pollination groups — will give you fruit from August to March and look handsomely deliberate rather than accidental.

If even that feels ambitious, train a pair of cordons along a sunny fence, 60–75cm apart and angled slightly outward, or plant a stepover to edge a path. Underplant with chives, comfrey or wild strawberries, and let the grass grow a little longer beneath the canopy. Plant well, stake properly, be patient for three years, and the garden will quietly reorganise itself around a tree you will still be picking from in thirty years' time.