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Gardening glossary

Grafting

Grafting is the reason every commercial apple, pear, peach, plum, almond, citrus, rose, and most ornamental trees you can buy are not "true to seed" propagations but composite plants. The fruit you eat is from the scion variety; the trunk, roots, and the plant's vigour come from a rootstock variety chosen for completely different reasons.

How grafting works. The cambium layer (the thin band of dividing cells just under the bark) of two plants is brought into intimate contact. Within days, the wounded tissues callus and the two cambium layers fuse, creating a continuous vascular system. Once water and sap flow freely across the union, the graft is healed and the combined plant grows as one.

Why gardeners and farmers graft:

- **Dwarfing.** Apple varieties on M9 or M27 rootstock stay 2–3 m tall and crop in two years, instead of growing 6–9 m and taking 6+ years. - **Disease and pest resistance.** Tomatoes grafted onto a resistant rootstock shrug off fusarium, verticillium, and nematodes that would kill the variety on its own roots. - **Climate adaptation.** Grafting a tender citrus variety onto a cold-hardy rootstock lets growers push beyond the cultivar's natural range. - **Multi-graft trees.** A "family apple" tree carrying four varieties on one trunk is created by grafting four different scions onto a single rootstock. - **Preserving cultivars.** Hybrid roses, named apple varieties, and most ornamentals do not breed true from seed. Grafting is the only way to perpetuate the exact plant.

Common grafting techniques:

- **Whip-and-tongue** — dormant-season grafting of pencil-thick scions and rootstocks. The standard for fruit trees. - **T-budding** — slipping a single dormant bud under a T-shaped flap of bark in summer. Used for roses and citrus. - **Cleft grafting** — splitting a thicker rootstock and inserting a scion wedge. Used for topworking established trees. - **Approach grafting** — joining two growing plants temporarily; useful for difficult unions.

Grafting is more advanced than the other propagation methods but well within reach of patient home gardeners. Tomato grafting in particular has surged in popularity for greenhouse growers chasing higher yields and disease resistance.

Where this comes up in our guides

Related terms

Propagation

Propagation is creating new plants from an existing one — through cuttings, division, layering, or seed. Most houseplants propagate easily from stem cuttings rooted in water or soil, making it the cheapest way to grow your collection.

Callusing

Callusing is the formation of a protective layer of undifferentiated cells over a cut or wound on a plant stem. Allowing cuttings and divisions to callus for 1 to 7 days before potting reduces rot and improves rooting success.

Layering (propagation)

Layering is a propagation method where a stem is encouraged to root while still attached to the parent plant — usually by pinning a flexible branch to the soil and burying part of it. The new plant is separated only after roots have formed.

Division (propagation)

Division is the propagation of clumping plants by splitting one mature plant into two or more sections, each with its own roots and growing points. It is the fastest, most reliable form of vegetative propagation for many perennials, grasses, and houseplants.