Why autumn is the best time to plant a bare-root tree

Bare-root trees are lifted from nursery beds while dormant, with the soil shaken from their roots. From November through to March, a tree that would cost a small fortune as a container-grown specimen can be bought for a fraction of the price, and it will often establish faster, because its roots are already used to growing in real ground rather than in a bag of compost. The window matters, though. Planting in autumn gives roots a chance to settle into still-warm soil before winter, so that by the time spring arrives the tree is ready to grow away without a pause.

Aim to plant as early in the season as you can, ideally between late October and mid-December. Bare-root trees planted in mild, damp autumn weather rarely need watering in the way that spring-planted trees do, and they suffer far less from drought stress in their first summer.

Choosing and checking your tree

Buy from a nursery that lifts to order or keeps its stock heeled in, rather than one that leaves bundles stacked in a yard. A good bare-root tree should have a sturdy, straight trunk, a well-balanced branch framework, and a root system with plenty of fine, fibrous roots. If the roots look dry, brittle, or snapped back to stumps, walk away.

• Whips and feathered trees (60–150cm) are cheapest and establish quickest; ideal for woodland and hedgerow planting.
• Standards have a clear trunk of 1.8m or more and suit avenues, boundaries and specimen positions.
• Native species such as field maple, hornbeam, birch, rowan, wild cherry, oak and hazel are the backbone of British woodland planting and support far more wildlife than most ornamental alternatives.

If you cannot plant the moment your tree arrives, heel it in: dig a shallow trench in a spare corner, lay the roots in it, and cover them with soil, firming gently. Keep the bundles shaded and check them weekly. Roots left exposed to wind and sun for even an hour or two can be permanently damaged.

Prepare the ground before the tree arrives

Ground preparation is the part most gardeners skip, and it is the part that decides whether the tree thrives. Start clearing and digging a few weeks ahead if you can. Clear grass and weeds in a circle at least a metre across for each tree — grass is a fierce competitor for water and nutrients, particularly in the first two years.

Dig the planting hole square rather than round; roots are less inclined to circle in a square hole. Make it wide, roughly three times the spread of the roots, but no deeper than the root system needs. Break up the bottom and sides with a fork to relieve compaction, especially on clay, but do not fill the hole with rich compost or manure. A pocket of rich material in poor surrounding soil encourages roots to stay put, and the tree can sink as the compost settles. Save the improvement for the mulch on top.

Planting at the same depth as the nursery soil mark

Look closely at the base of the trunk. There is usually a darker band where the soil level sat in the nursery bed — that is your guide, and it should end up at or just below the finished soil surface. Planting too deep is the most common and most fatal mistake with trees; burying the root collar encourages rot and slow decline.

Position the tree, spread the roots out evenly over a cone of soil, and check the height with a cane laid across the hole. If you are planting a grafted fruit tree, keep the graft union 10–15cm clear of the soil.

• Backfill in layers, working soil gently between the roots with your fingers.
• Firm each layer with your heel, but never stamp on saturated ground.
• Finish with a gentle tug on the trunk — it should feel anchored, not loose.
• Water thoroughly, even if rain is forecast, to settle the soil around the roots.

Staking, mulching and guarding

Stake only if the site is windy or the tree is a standard with a large canopy. Use a short stake driven in at 45 degrees, or a low stake on the windward side, and tie with a soft, adjustable tie that allows the trunk to flex. Movement builds stronger trunks, so remove stakes and ties after two or three years.

Spread a mulch of well-rotted bark or garden compost in a ring 5–8cm deep, keeping it clear of the trunk. This suppresses weeds, holds moisture and feeds the soil slowly. In woodland planting, protect whips with spiral guards or a mesh sleeve against rabbits and deer, and consider a tree shelter on exposed or windy sites.

Looking after the tree in its first year

For the first two summers, water deeply and occasionally rather than little and often — a full watering can per tree each week in dry spells. Keep the mulch topped up, and clear any grass or weeds that creep back into the ring. Check ties and guards each spring, and loosen anything that has become tight.

For a native woodland or shelterbelt, plant whips at roughly 1.5–2m spacing in staggered rows, mixing species so that one disease or pest cannot sweep through the whole planting. Autumn work done properly now gives you a wood that will outlive us all — and there is not much in gardening more satisfying than that.