Before buying a fruit tree, check three things together: the variety, the rootstock and its pollination needs. The variety determines the fruit you are choosing; the rootstock has a major influence on the tree’s vigour; pollination determines whether its flowers can set a worthwhile crop.
For example, Red Falstaff on M26 combines a self-fertile apple with a dwarfing rootstock. Check both names on the label: a Red Falstaff on more vigorous roots needs more room.
What Is a Rootstock?
Most apples, pears, plums and cherries sold for gardens are grafted. The upper part, called the scion, is the named fruit variety. The lower trunk and roots belong to the rootstock. The healed join is usually visible as a change or swelling near the base of the trunk.
This lets a nursery combine the fruit you want with roots that suit a particular size or growing system. Pollination needs still belong to the fruiting variety: a tree that needs a partner will need one on dwarfing roots too.
Keep the graft above soil or compost level when planting. If the scion roots above the join, it can escape some of the size restriction. Shoots growing from below the graft are rootstock growth, so do not mistake them for a useful new branch of your chosen variety.
Apple Rootstocks: Which Ones Suit a Small Garden?
| Rootstock | Where it makes sense |
|---|---|
| M27 | A very small tree, roughly 1.2–1.8m tall as a bush; needs good soil, careful watering and permanent support |
| M9 | A smaller tree, roughly 1.8–2.4m tall as a bush; needs permanent support and can suit a container |
| M26 | A small tree, roughly 2.4–3m tall as a bush; also useful for trained forms and substantial containers |
| MM106 | A larger tree, roughly 3–4m tall as a bush; usually too vigorous for a modest patio pot |
The smallest rootstock is not always the best purchase. M27 has limited vigour and is a poor choice for weak growing conditions. M9 needs reliable moisture and permanent support. M26 gives more growth to work with, but its branches still need space.
These are approximate bush-tree heights, not the eventual size of every tree in a pot. Soil, variety, climate, pruning and the shape you train all affect the result. Check spread too: a tree that is easy to reach at the top can still occupy much of a narrow garden.
For specific varieties on suitable roots, see the apple trees for pots comparison.
Pear, Plum and Cherry Rootstocks Are Different
Rootstock codes do not carry across from one fruit to another. For pears, Quince C and Quince Eline are dwarfing choices; Quince A is more vigorous and useful for a larger framework such as an espalier. Decide whether you want a free-standing bush, a container tree or a trained boundary before choosing.
For cherries, Gisela 5 restricts growth more than Colt. A general paragraph about dwarf cherries on a product page does not mean every tree in its buying menu is on Gisela 5. Read the selected option, not just the introduction.
For plums, Pixy is less vigorous than St Julien A, but even a smaller plum is a real tree. Check its expected spread and intended training form. Avoid planning to solve a poor size choice by repeatedly cutting the tree hard.
Figs are different again: a naturally compact variety can be useful without a named dwarfing rootstock. Blueberries and other soft fruit should be selected by their own growth habit and soil needs rather than by applying apple rootstock rules.
What Does Self-Fertile Mean?
A self-fertile variety can set fruit using its own pollen. That is useful when you only have room for one tree. It does not mean every flower will become a fruit, or that weather and pollinating insects no longer matter.
A partially self-fertile tree can set some fruit on its own, but another compatible variety is especially useful. A self-sterile variety needs suitable pollen from elsewhere. Two trees of the same self-sterile variety generally do not solve that problem, even if they come from different nurseries.
When a nearby garden already contains a compatible tree, you may not need to buy another. Check the variety and flowering overlap where possible. An apple cannot provide the right pollen for a pear simply because both blossom in spring.
Use Flowering Groups, Not Harvest Dates
Pollination groups describe when the flowers open. They are not a calendar of when the fruit ripens. An early-picking apple and a later keeper can flower together and make a useful pair.
With apples, varieties in the same or adjacent flowering groups usually have enough overlap, although compatibility still needs checking. Use one nursery’s pollination chart consistently because group labels can differ between suppliers. For cherries in particular, flowering at the same time is only part of the compatibility check.
Triploid apples need special attention. Their pollen is generally unsuitable for pollinating another tree, so a triploid is a poor choice as the only partner for a self-sterile apple. The usual solution is a compatible group of three varieties, including two that pollinate each other. A suitable self-fertile partner can simplify some combinations; confirm the exact pairing before buying.
Bramley’s Seedling is a familiar triploid example. If you only have room for one small tree, a self-fertile dessert apple is usually a simpler starting point than building a pollination plan around a triploid cooking apple.
Check the Supplied Form Before Ordering
A bare-root tree arrives dormant without a pot of compost. A container-grown tree arrives rooted in a nursery pot. Neither description tells you the eventual size: the rootstock and variety still need checking.
A maiden is a young tree that gives you scope to develop its framework. A ready-trained espalier arrives with its structure already started. Buying an ordinary bush tree and expecting it to arrive flat against a frame will leave you with a different job from the one you planned.
Before you pay, read the selected option again. Confirm the rootstock, number of trees, nursery pot size or bare-root form, and delivery arrangement. Some pages mix dwarfing and more vigorous versions of the same variety, so changing the pack option can change the tree you are buying.
Once those details fit, the small-garden fruit-tree guide helps you choose by the space and crop you want. For a patio without room for a tree, the soft-fruit guide offers smaller alternatives.
For the detailed reference tables, see the RHS rootstock guide and RHS fruit-pollination guide.
