A small garden can hold a tree, and usually it should. One well-chosen tree gives height, shade, somewhere for birds to perch and a focal point that changes through the year. The difficulty is that in a modest plot every tree is on show every day, so it needs to stay in proportion and look good for more than a fortnight in spring. Choosing well comes down to a handful of questions about size, soil, light and seasons of interest – and a shortlist of trees that answer them.
Start with the eventual size, not the size in the pot
Nursery labels often give a height “after ten years”, which can be a long way short of what the tree will eventually reach. Look for the mature height and spread, and be honest about the space you have. As a rough guide, a tree whose mature spread is wider than about half the width of your garden will end up dominating it or needing regular, costly reduction.
Shape matters as much as size. Upright, narrow forms (described as “fastigiate” or “columnar”) take up far less ground than spreading ones and suit side borders and front gardens. Multi-stem trees give a lighter, airier effect than a single heavy trunk and can be thinned from the base as they grow.
Think about the house and the neighbours
On shrinkable clay soils, which are common across much of south-east England, thirsty trees growing close to buildings can contribute to subsidence as their roots draw water from the ground. Willows, poplars and oaks are the usual concern; most of the small ornamental trees in this article are far less demanding, but it is still sensible to plant well away from foundations, drains and boundary walls. Remember too that a tree on your side of the fence will shade someone else’s garden, and overhanging branches are a common cause of neighbour disputes.
Check your conditions
- Soil: heavy clay, free-draining sand and chalk each favour different trees. A quick look at what thrives in nearby gardens tells you a lot.
- Light: most flowering and fruiting trees need sun for at least half the day. Shady corners suit amelanchier, rowan and some Japanese maples better.
- Exposure: coastal and windy sites need tough, wind-tolerant species such as hawthorn and rowan rather than delicate maples.
Trees that earn their place
Rowan (Sorbus)
Rowans are among the best all-round small trees for British gardens. They have neat, feathery leaves, flat heads of white flowers in late spring and clusters of berries that birds strip in autumn. Many also colour well before leaf fall. Beyond the native red-berried Sorbus aucuparia, look at ‘Joseph Rock’, with yellow berries and rich autumn foliage, or Sorbus vilmorinii, a compact species with pink-tinged berries. Rowans dislike waterlogged ground but cope well with exposure.
Multi-stem birch (Betula)
Birches cast light, dappled shade, so you can still grow plants beneath them. The white-barked Himalayan birch, Betula utilis var. jacquemontii, is the classic choice, and grown as a multi-stem it gives several gleaming trunks that light up a winter garden. Birches do grow tall eventually, so give them a little room and avoid planting them right beside the house. Prune only in late summer or autumn, as they bleed sap heavily if cut in late winter.
Crab apple (Malus)
Crab apples offer blossom, fruit and often good autumn colour on a tree that stays compact. ‘Evereste’ has white flowers opening from pink buds and orange-red fruit that hangs on into winter. ‘Red Sentinel’ holds glossy dark red fruit for months, and ‘John Downie’ produces larger fruit that is good for jelly. Crab apples are also excellent pollinators for nearby eating apples.
Snowy mespilus (Amelanchier lamarckii)
Amelanchier gives you three seasons in one plant: a froth of white blossom with coppery young leaves in spring, small dark berries in early summer, and fiery autumn colour. It is often sold as a multi-stem, copes with partial shade and prefers soil that is not strongly alkaline.
Trees for bark and structure
The paperbark maple, Acer griseum, is slow-growing with peeling cinnamon bark that glows in low winter sun. The Tibetan cherry, Prunus serrula, has polished mahogany bark that people cannot resist touching. Both make a strong feature where the tree will be seen from a window all winter.
Fruit trees on dwarfing rootstocks
If you would rather eat your tree, apples and pears grafted onto dwarfing rootstocks stay small enough for a modest garden. For apples, rootstocks such as M27 and M9 produce very compact trees, while MM106 gives something larger. Trained forms – cordons, espaliers and step-overs – let you grow fruit against a fence or along a path edge with almost no ground space.
Trees to think twice about
Some popular choices cause problems in small spaces. Leyland cypress grows very fast and quickly becomes a maintenance burden. Weeping willows want space and water. Sycamore, ash and horse chestnut seedlings are best removed while small, because they will outgrow most gardens. Large flowering cherries can also be wider than their label suggests.
Planting for a good start
Bare-root trees, available from late autumn to early spring, are usually cheaper and establish well. Container-grown trees can be planted at any time if you water them properly, but autumn and winter remain the easiest seasons. Dig a wide, shallow hole rather than a deep one, plant so the flare at the base of the trunk sits at soil level, and use a short stake set low on the stem so the trunk can flex and strengthen. Keep a weed- and grass-free circle around the base and water thoroughly during dry spells for the first two or three summers; a properly applied layer of mulch around the base helps with both.
Finally, plan the maintenance before you plant. Most of the trees here need little more than the removal of dead, crossing or damaged branches, done at the right time of year – our season-by-season pruning guide covers when to do it. Choose a tree that fits the space from the start, and you should never have to fight it.