Grafting

Grafting sounds technical, but the idea is simple. It means joining two different plants so they grow on as one. The lower part — the roots and a short length of stem — is the rootstock. The upper part, the variety you actually want to eat, is the scion. A grower fuses a bud or shoot of the chosen variety onto the rootstock, the two knit together, and from then on they live as a single tree.

Almost every fruit tree you can buy in the UK is grafted. There are two main reasons for this, and both matter to a beginner choosing a tree.

Why fruit trees are grafted

Size control. The rootstock, not the variety, decides how big and vigorous the tree becomes. The very same apple variety can be a 1.5m patio tree or a 4m giant depending entirely on what it's grafted onto. In a typical UK garden, where space is tight, that's hugely useful — you pick a dwarfing rootstock and keep the tree to a size you can prune and pick without a ladder.

Reliable, true-to-type fruit. If you sowed a pip from a shop-bought apple, the seedling would be a gamble — fruit trees don't come true from seed, and you'd likely get something small and sour years down the line. Grafting sidesteps all that. The scion is a clone of a known, named variety, so a grafted 'Victoria' plum or 'Conference' pear fruits exactly as it should, and far sooner than a seedling would.

Grafting also lets growers put a variety with weak or fussy roots onto a tougher, disease-resistant rootstock, and it's how more than one variety can be grown on a single "family" tree — handy where there's only room for one trunk.

The graft union

Look low on the trunk of any fruit tree, a few centimetres above the soil, and you'll usually spot the join: a slight kink, bulge or change in bark texture. This is the graft union, where rootstock and scion fused together.

It's worth knowing for one practical reason. Keep the graft union above the soil and above any mulch when you plant. If it's buried, the scion can root into the ground on its own, escape the rootstock's control, and grow into a far bigger tree than you bargained for. Any shoots that appear from below the union are the rootstock trying to take over — rub or cut them off, as they won't bear the fruit you want.

So when you read a UK fruit-tree label naming both a variety and a rootstock, the graft is the quiet bit of craft that brings the two together — and the reason you can grow proper, named fruit on a tree sized to your garden.