Trees: Planting & Care

Trees need careful planting and care in their first years, so this guide shows you how to choose, plant, water, prune and protect trees.

Tree care is the set of decisions that determine whether a tree lives for decades: choosing a species that fits the site, planting it with the root flare at ground level, watering deeply and mulching while it establishes, pruning only with a reason, and catching disease early.

A tree is a decades-long commitment, and nearly all of its long-term health is decided in the first few years by four things: planting it at the right depth, choosing a species that suits the site, watering and mulching it in a way that builds deep roots, and pruning only when there’s a reason. This guide connects the tree and shrub guides so you can choose, plant, maintain and protect trees in a logical order.

Tree problems are slow to appear and slow to fix, so the order matters more here than in most of gardening. Choose the species and site first, plant correctly, establish with deep watering and mulch, prune lightly, and watch for disease early. Soil conditions underpin all of it, so keep the soil, water and fertilizer guides and the pests and diseases guides close.

The tree decision path

Why planting depth decides a tree’s lifespan

The root flare is the point at the base of the trunk where it widens into the main roots. It must sit at or just above the soil surface. If it’s buried, bark that isn’t adapted to constant moisture stays damp, invites rot, and trees can develop roots that circle the trunk and slowly strangle it, which often shows up ten or more years later as sudden decline. Most nursery trees arrive planted too deep in their container, so scrape back the top layer of mix until you find the flare before you dig. The hole should be as deep as the root ball and two to three times as wide, so roots meet loose soil sideways rather than a smooth, hard wall. The full method is in how to plant a tree properly.

Matching the tree to the site

Most tree failures are mismatch failures rather than care failures. A tree sold at two metres in a pot may reach ten or twenty metres, with roots that spread as wide as the canopy or wider. Before buying, measure the distance to buildings, drains, boundaries and overhead lines, check whether the soil is waterlogged in winter or dry in summer, and confirm the tree’s hardiness for your coldest winter. Shade trees and fruit trees carry different trade-offs, covered in best shade trees and fruit trees for beginners.

Establishing a tree: watering and mulch

A newly planted tree has lost much of its root system and can’t reach deep water yet, so it depends on you for the first one to three years. Slow, deep watering that soaks the root zone to depth, repeated when the soil has dried, grows deeper roots than frequent light sprinkling. A ring of mulch about 5 to 8 cm deep, kept back from the trunk so it doesn’t touch the bark, holds moisture, moderates soil temperature and suppresses grass that competes for water. Piling mulch against the trunk, the so-called mulch volcano, holds moisture against the bark and invites rot and pests. The routine is set out in tree watering and mulching.

Pruning: fewer, better cuts

Every cut is a wound, and a tree responds to a wound by sealing it off rather than healing it. That is why the question is never “how much can I take off” but “what is the reason for this cut”. Valid reasons are removing dead, diseased or damaged wood, clearing crossing branches that rub, and shaping young trees for structure. Cuts are made just outside the branch collar, the swollen ring where a branch meets its parent, and not flush with the trunk. Timing varies by species, and some trees bleed sap or are prone to disease entering fresh cuts at certain times, so check the guide before cutting. How to prune trees safely covers cuts, timing and tools, and shrub maintenance and renewal pruning applies the same logic to smaller woody plants.

Tender and tropical trees

Palms and tropical trees grow from a single growing point, so frost damage to the crown is often fatal. They also feed heavily, and shortages of potassium and magnesium show as discoloured, spotted or frizzled fronds. Protection against cold, feeding with a palm-specific fertilizer and cutting only fronds that are fully dead are the main practices, detailed in palm and tropical tree care. For cold-snap tactics that apply to many tender plants, see frost protection methods.

Spotting tree problems early

The identification and organic treatment steps are in tree diseases, and the wider prevention approach is in the pests and diseases guides.

How tree planting and care affect roots, growth and health

Oak and maple need space, and birch tolerates poor soil. Willow tolerates wet clay, while olive needs sharp drainage. Mulch of 5 to 8 cm protects roots and reduces weeds. Keep mulch 10 cm from the trunk, because contact causes rot. Compost feeds cherry and plum and improves clay. Apple and pear need pruning in winter, while plum and cherry need pruning in summer to prevent silver leaf. Water a new tree 20 litres weekly for 2 years, because roots need time to spread. Plant at the root flare, since deep planting causes rot and kills roots. Stake for one year at most, because movement builds strong roots. Cedar and pine shed needles, and snow weighs on them. Canker attacks apple, and blight attacks pear. Aphid attracts ladybird to cherry, and ladybird controls aphid. Fig and citrus need shelter below 0°C. You can check the root flare, and you’ll catch deep planting early. Hire a qualified arborist for large trees, and ask your extension service about local tree diseases.

What questions does this guide answer?

Quick answers to the questions people ask most, each linked to the guide that answers it in full.

What does each guide cover?

Planting: How to plant a tree properly

Most trees are sold planted too deep in their container, so the first job is finding the root flare. The hole should be wide, not deep, with firm but not packed backfill, and water applied slowly after planting. The guide gives a ten-minute method and explains why leaving the flare buried causes slow decline years later.

Choosing shade: Best shade trees for home gardens

A shade tree needs the right mature size, strong branch structure and non-aggressive roots for its position. The guide compares fast and slow growers, notes litter and brittleness, and explains how far from buildings and drains to plant.

Fruit: Fruit trees for beginners

Fruit trees differ in pollination needs, rootstock size and disease risk. The guide recommends forgiving species and varieties, explains rootstock sizes and shows what to expect in the first harvest years.

Pruning: How to prune trees safely

Pruning is a series of wounds, so each cut needs a reason. The guide shows cuts just outside the branch collar, timing by tree type and the point at which to hire a qualified arborist instead of cutting yourself.

Tropical species: Palm and tropical tree care

Palms and tropical trees need warmth, regular feeding and protection from frost, and often show nutrient shortages in their fronds. The guide covers fertilizing, frond removal and winter cover.

Water and mulch: Tree watering and mulching

Deep roots come from slow, deep watering and a ring of mulch. The guide gives depths, ring size and the mulch volcano mistake to avoid.

Shrubs: Shrub maintenance and renewal pruning

Shrubs need pruning at specific times depending on when they flower. The guide explains renewal pruning, which removes a share of the oldest stems each year to keep the shrub vigorous.

Disease: Tree diseases: identification and organic treatment

The guide helps you recognise leaf spots, cankers, mildews and pest signs, and sets out organic steps such as sanitation, pruning at the right time and improving airflow.

Young trees: Staking and Protecting Young Trees: Stakes, Guards and Winter Care

The guide explains when a tree needs a stake, how to tie and remove it, and how guards and winter wrap protect bark from animals, mowers and frost.

Pruning tools: Best Pruning Tools and Loppers

The guide compares bypass and anvil blades, cutting capacity from secateurs to saws, and tells you when a branch is too big or too high to cut yourself.

How do rootstocks control the size of a fruit tree?

Most fruit trees are grafted onto a rootstock, and the rootstock decides how large the tree becomes, how soon it fruits and how well it copes with poor soil. Sizes below are approximate for apples and vary with soil and variety.

When should you prune each type of tree?

How deep and how wide should mulch go?

How do the tree decisions affect each other?

A buried root flare causes damp bark and girdling roots, which cause slow decline and sudden failure years later. Shallow watering keeps roots near the surface, which makes the tree vulnerable to drought and wind throw. Heavy pruning triggers vigorous weak shoots, which creates more pruning work and more wound sites for disease. Choosing a tree too large for its site leads to repeated heavy cutting. Good decisions compound the same way, which is why choosing, planting and establishing correctly make later care small.

Key terms

• Root flare: the widening at the base of the trunk where the main roots begin.
• Branch collar: the swollen ring at the base of a branch, where pruning cuts are made just outside.
• Rootstock: the root system a fruit tree is grafted onto, which controls final size.
• Girdling root: a root that circles and constricts the trunk or other roots.
• Dieback: the progressive death of shoots from the tips backward.

Common mistakes in tree care

1. Planting too deep. A buried flare rots bark and sets up girdling roots, so find the flare first.
2. Choosing by looks, not mature size. The tree outgrows its space, so check the final height and spread.
3. Mulching against the trunk. Trapped moisture rots bark, so keep a gap of a few centimetres.
4. Light, frequent watering. It keeps roots shallow, so soak deeply and less often.
5. Topping or heavy pruning. It triggers weak regrowth and decay, so take small cuts with reasons.

Where to go next

Start with planting if you have a tree waiting, or choosing if you don’t. Tree health depends on the ground, so read the soil, water and fertilizer guides, and use the seasonal gardening guides to place tree jobs on the calendar.