Propagating Plants from Cuttings — Rooting a Snip into a New Plant

Cut a piece of stem off a plant, treat it right, and it will grow brand-new roots from its cut end and become a whole plant — an exact clone of the parent. The trick is that a fresh cutting has NO roots yet and cannot drink, so your whole job is to keep it from wilting while it makes them.

Choose a healthy, non-flowering shoot and cut about a 10 cm length, slicing cleanly JUST BELOW a node (the little bump where a leaf joins the stem). Nodes are where roots form most readily, so a cut right under one roots best. Use a sharp, clean blade so you don't crush or infect the stem.

Pull off the leaves from the lower half so a bare node can sit in the medium, and leave just two to four leaves at the top. If those leaves are big, cut each in half — the cutting loses water through its leaves but can't yet replace it, so less leaf means less wilting.

Optional but helpful: dip the cut end in rooting hormone, which is the plant growth signal AUXIN that tells cells to make roots. No hormone? Soak chopped young willow twigs in water overnight and use that 'willow water' — willow is naturally rich in the same rooting compounds.

Push the cutting into a moist, airy mix of potting soil and perlite (the perlite keeps it draining so the stem doesn't rot), burying the bare node. For easy plants like mint, coleus or willow you can simply stand the cutting in a jar of water on a windowsill and watch roots appear.

Cover the pot with a clear plastic bag or propagator lid to trap humidity, and keep it warm in bright but INDIRECT light (direct sun cooks it). The moist air stops the leafless-rooted cutting from drying out while it works. Mist now and then; air it occasionally so it doesn't go mouldy.

After a few weeks give the cutting a gentle tug — springy resistance means roots have formed. Once it's well rooted, pot it up into normal compost, label it, and gradually harden it off to ordinary conditions.

A cutting works because plant cells are astonishingly flexible: ordinary stem cells near a cut, especially around a node and the growth layer (cambium), can switch jobs and grow brand-new roots where roots never were — these are called ADVENTITIOUS roots ('arising in an unusual place'). What drives them is a hormone, AUXIN, which the plant naturally pools at the base of a shoot and around nodes; that is why you cut just below a node and why dipping the end in rooting hormone (extra auxin) or willow water speeds things up. Like garlic and potato, a cutting is VEGETATIVE propagation — the new plant is a genetic clone of its parent, with all the same benefits (true to type, fast, keeps a variety exactly) and the same catch (no genetic mixing, and any disease is copied along). But a cutting has one special difficulty the clove and the tuber don't: a clove and a tuber come pre-packed with stored food and, for the tuber, ready buds, whereas a bare stem cutting has neither roots to drink with nor much of a food store — so for the days or weeks before it roots, it is a leaf that can lose water but cannot yet take any up. That single fact explains the entire technique: strip and halve the leaves to cut water loss, and seal the cutting in humid air so it barely loses water at all, buying it time to grow the roots that will save it. Cuttings come in a family: SOFTWOOD (soft spring tips, quick but wilt-prone), SEMI-RIPE (summer, part-woody), and HARDWOOD (dormant leafless winter stems of currants, roses and willow — so easy they root pushed straight into the ground). Some plants even root from a LEAF (succulents, African violet) or a piece of ROOT. It is one of the oldest and most powerful tricks in horticulture — one prized plant can become a hundred.