Why the First Spring Matters Most

A birch or maple planted last autumn or winter is still finding its feet. Its roots have not yet spread much beyond the original planting hole, so for the first two or three growing seasons it leans on you for water, for a clear patch of ground and for a bit of protection from the weather. Get spring right and by midsummer you will see strong extension growth, healthy leaf colour and a tree that is clearly settling in. Get it wrong and you spend the rest of the year watching a sulking specimen shed leaves in August.

The two genera have different temperaments. Birches are shallow-rooted and quick to suffer in drought — a drooping Betula utilis or silver birch in July is usually a watering failure rather than a disease. Maples are more varied: field maple is forgiving once established, while Japanese maples and the larger Norway types want consistent moisture and some shelter from the fiercest midday sun. The spring routine, though, is much the same for both.

Check Stakes, Ties and Tree Guards

Winter wind, frost heave and the simple settling of the soil will have loosened things. Before the leaves break, walk round every young tree and give the supports a proper inspection.

• Feel the tie. You should be able to slide a finger between the tie and the bark. If it is biting in, loosen it a notch — a tie that is too tight girdles the trunk as it thickens.
• Look for rubbing. Any point where the stake, guard or tie touches and chafes the bark needs adjusting. Wounds here are an open door for infection.
• Test the stake. Push it firmly. If it wobbles in the ground, re-drive it. A stake that moves is worse than no stake at all.
• Check guards and spirals. Clear any dead grass or debris that has collected inside, and make sure rabbit guards still reach above the likely snow line.
• Plan the exit. Most small trees should be free of their stake after two to three years. A tree left tied up for a decade develops a weak trunk that snaps the first time it meets a real gale.

Water Deeply, and Only When It Counts

Little and often is the classic mistake. A daily splash from a watering can wets only the top few centimetres of soil, encouraging roots to stay shallow and making the tree more vulnerable, not less. You want to soak the root zone thoroughly and then let it dry slightly before repeating.

For a newly planted tree, aim for roughly 10 to 20 litres a week in dry weather, poured slowly into a ring around the trunk rather than against the bark itself. A punctured bucket set beside the tree, or a length of soil pipe sunk next to the rootball, delivers water straight down to where it is needed. Water in the cool of the evening so less is lost to evaporation.

How do you know whether to water at all? Push a trowel into the soil about 15cm out from the trunk. If it is dry at 10cm down, water. If it is damp, wait. A wet British spring may mean you need do nothing until May, but a dry April will catch you out, and it is the dry April that does the damage.

Clear the Competition

Grass is the worst rival a young tree has. It is greedy for water and nutrients, and its roots knit together into a mat that young tree roots struggle to penetrate. A circle of bare soil around the trunk is not a tidiness exercise — it is one of the most useful things you can do.

• Hand-weed a ring at least 60cm across, wider for a large maple or a tree in heavy grass.
• Avoid deep hoeing close to the trunk; birch roots run near the surface and are easily sliced.
• Keep that clear ring for the first three years, after which the tree can hold its own.
• If you use a mulch to suppress weeds, top it up rather than letting it thin to nothing.

Mulch: A Spring Blanket That Does Real Work

Apply a 5–7cm layer of well-rotted bark, composted green waste or leafmould in mid to late spring, once the soil has begun to warm. Mulch does three jobs at once: it holds moisture in, suppresses weeds and slowly feeds the soil as it breaks down. On a light, sandy soil it can make the difference between a tree that thrives and one that merely survives.

Keep the mulch clear of the trunk, leaving a gap of about 5–10cm. Piling it against the bark traps damp around the collar and invites rot. If the soil is dry when you come to mulch, water thoroughly first — mulching over dry ground simply locks the dryness in.

There is no need to feed a newly planted tree with a high-nitrogen fertiliser in its first spring. The mulch is doing that job gently, and forcing soft growth too early can leave the tree exposed to a late frost.

Keep an Eye Out for Trouble

Walk the trees once a week through spring and you will spot most problems early. Late frosts can blacken fresh maple leaves, though established trees usually reshoot without harm. Aphids cluster on soft maple growth in May — a strong jet from the hosepipe often deals with them, and the ladybirds will arrive soon after. Birch leaf miner leaves brown blotches on the foliage in early summer; it looks worse than it is, and a healthy tree shrugs it off.

Check the leaves for scorch — crisp brown edges on Japanese maples usually mean wind and sun rather than drought, and a little shade cloth or a move to a sheltered spot is the answer. Above all, keep watering. A birch or maple that goes into its first summer with damp soil beneath it will reward you with decades of shade, catkins and autumn colour.