Question 1

What is grafting, and how does it work?

Accepted Answer

Joining part of one plant onto another so they grow as a single individual — the **scion** supplying the top growth and the **rootstock** supplying the roots. It works because plants can heal a wound between two compatible tissues into a functioning union.

**The biological mechanism.** Between the bark and the wood of a stem lies the **cambium**, a thin layer of actively dividing cells that produces new conducting tissue. Grafting succeeds when the cambium of the scion is placed in firm contact with the cambium of the rootstock. Both produce callus tissue, the callus cells differentiate into new xylem and phloem, and the plumbing connects across the join. **If the cambium layers do not line up, nothing happens** — which is why grafting technique is mostly about making a clean matching cut, not about the cut's shape.

**Why it is done at all:**

**Rootstocks control size**, which is the main reason in fruit. The same apple variety on a dwarfing rootstock stays small enough to pick from the ground; on a vigorous one it becomes a full-sized tree.

**Disease and soil tolerance.** Rootstocks confer resistance the scion lacks — grapevines worldwide are grafted onto American rootstocks because of phylloxera, which is the reason European wine survived at all.

**Clonal propagation of plants that do not come true from seed.** Apple pips produce a different tree, not a copy; every named variety exists only as grafted material.

**Speed to cropping**, since grafted material is mature tissue and flowers years sooner than a seedling.

**Multiple varieties on one tree**, which also solves pollination in a small garden.

**Compatibility is the constraint.** Grafting generally works within a species, usually within a genus, rarely beyond it.

**Practical points:** the **graft union** — the visible bulge low on the stem — must be kept **above soil level**, otherwise the scion roots and the rootstock's size control is lost entirely. Growth appearing **below** the union is rootstock suckering and should be removed at source.

**Budding**, using a single bud rather than a shoot, is the commonest commercial method.

Question 2

What is a rootstock and why does it matter for fruit trees?

Accepted Answer

A rootstock is the root system a fruit tree is grafted onto. The scion — the variety you actually want, such as a Cox or a Bramley — is joined to it, and the rootstock determines much of how the tree

Question 3

What are espalier, cordon and fan training?

Accepted Answer

They are methods of training a fruit tree flat against a wall or wires, and they exist because a two-dimensional tree fits where a normal one cannot, ripens better, and is far easier to pick, prune

Question 4

How do you take a cutting, and what are the different types?

Accepted Answer

By removing a piece of stem and inducing it to produce roots — and the type of cutting is determined by how mature the wood is, which in turn determines when you take it and how you treat it. Why it

Question 5

What does pruning actually do to a plant?

Accepted Answer

It redirects growth rather than simply removing material — and understanding the mechanism is what turns pruning from guesswork into something predictable. The central principle: apical dominance.

Question 6

How does a seed know which way is up?

Accepted Answer

It detects gravity using falling starch grains inside specialised cells — a mechanism that works regardless of light, soil depth or which way up the seed happened to land, which is why planting

Question 7

What are layering and division?

Accepted Answer

Two propagation methods that avoid the difficult part of taking cuttings, because the new plant stays attached to the parent or already has roots. Layering. A stem is encouraged to root while still

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