Plant Propagation: Multiply Plants for Free

Cuttings

Taking cuttings is the most widely used propagation method, and for good reason — it is simple, reliable for a huge range of species, and produces genetic clones of the parent plant. The technique varies depending on the maturity of the wood.

Hardwood cuttings are taken in late autumn or winter from the current year's fully ripened growth. Select pencil-thick stems, cut into lengths of fifteen to twenty-five centimeters, make a flat cut at the bottom just below a node and an angled cut at the top just above a node — the angle reminds you which end is up. Push the cuttings two-thirds deep into a trench of sandy soil in a sheltered spot outdoors, water them in, and leave them until the following autumn. Hardwood cuttings are slow but almost effortless. Willows, currants, gooseberries, figs, grapes, and dogwoods root readily from hardwood cuttings with no hormone treatment and no special equipment. This is how food forests are built on a budget — one currant bush becomes twenty within a year.

Softwood cuttings are taken in late spring or early summer from the current season's new, soft growth. They root faster than hardwood cuttings — often within two to four weeks — but require more attention, since the soft stems wilt quickly without roots. Take cuttings ten to fifteen centimeters long, strip the lower leaves, dip the base in rooting hormone, and insert into a pot of perlite, vermiculite, or a fifty-fifty mix of peat and sand. Cover with a clear plastic bag or place in a propagator to maintain high humidity. Mist regularly. Softwood cuttings work well for herbs (rosemary, sage, lavender, mint), hydrangeas, and many shrubs.

Semi-ripe cuttings bridge the two seasons — taken in late summer from growth that has begun to firm at the base but is still soft at the tip. They combine some of the speed of softwood cuttings with the resilience of hardwood. Semi-ripe cuttings are the standard method for evergreen shrubs, camellias, and many fruit tree rootstocks. Strip the lower leaves, wound the base by removing a thin sliver of bark, apply rooting hormone, and set in gritty compost in a cold frame over winter.

Layering

Layering exploits a plant's natural tendency to root where a stem contacts soil, making it ideal for species that resist rooting from cuttings.

Simple layering involves bending a low, flexible branch to the ground, wounding the underside where it contacts the soil by scraping away a strip of bark, pinning it down with a wire staple or a stone, and burying the wounded section under five to ten centimeters of soil. The tip of the branch remains exposed above ground. Roots form at the wound over several months. Once well rooted — test by tugging gently — sever the new plant from the parent and transplant it. Simple layering works beautifully for hazels, rhododendrons, clematis, jasmine, and many fruit tree guild species like currants and gooseberries.

Air layering achieves the same result on branches too high or too stiff to bend to the ground. Select a healthy branch, remove a ring of bark two to three centimeters wide to expose the cambium, dust with rooting hormone, wrap the wound in a generous handful of damp sphagnum moss, and seal the moss in place with plastic wrap tied tightly at both ends. Check monthly for root development by peeling back the plastic. Once a thick ball of roots is visible through the moss — typically two to six months depending on species — cut below the root ball and pot up the new plant. Air layering is the standard method for propagating difficult-to-root tropical trees, citrus, and many ornamentals.

Layering is slower than cuttings but has a much higher success rate for reluctant species, since the developing roots are sustained by the parent plant's water and nutrients throughout the process. For valuable or irreplaceable plants, layering is the lowest-risk method of propagation.

Grafting

Grafting joins the top portion of one plant (the scion) to the root system of another (the rootstock), combining the best qualities of each. It is the reason you can grow a specific named apple variety on a tree that stays two meters tall, or a delicate peach on roots that tolerate heavy clay.

The underlying principle is that the scion determines the fruit variety, flower colour, or other above-ground characteristics, while the rootstock determines tree size, vigour, disease resistance, and adaptation to soil conditions. Nearly all commercially grown fruit trees are grafted — the Granny Smith apple on your tree is genetically identical to every other Granny Smith in the world, clonally propagated by grafting for over a century.

The most common technique for beginners is the whip-and-tongue graft, done in late winter when both scion and rootstock are dormant. Select scion wood — pencil-thick one-year growth — and a rootstock of matching diameter. Make a long, sloping cut on each, then cut a thin tongue into each slope. Interlock the tongues so the cambium layers of scion and rootstock align precisely — this is the critical step, since new growth occurs only at the cambium — and bind tightly with grafting tape. Seal any exposed cuts with grafting wax to prevent desiccation. Within weeks, the cambium layers fuse, and the scion begins to grow on the rootstock's root system.

Bud grafting (T-budding) is used in summer, inserting a single bud from the desired variety under the bark of the rootstock. It uses less scion material — important when propagating a rare variety — and has high success rates in skilled hands. Most nursery fruit trees are produced by bud grafting.

Division

Division is the simplest and most reliable propagation method for herbaceous perennials, bulbs, and rhizomatous plants. It requires no special skill and produces new plants that establish almost immediately.

Clump-forming perennials — hostas, daylilies, ornamental grasses, many herbs, rhubarb, comfrey, and most companion planting species — are divided by lifting the clump, splitting it into sections each containing roots and shoots, and replanting immediately. The best time for most species is early spring as new growth emerges, or autumn after flowering. Use a sharp spade for large clumps, or two back-to-back garden forks levered apart for tough crowns. Each division should have at least three to five growing points for fastest re-establishment.

Bulbs and corms multiply naturally underground, producing offsets that can be separated and replanted at the appropriate depth and spacing. Garlic is the classic example — each clove planted in autumn produces a full bulb by summer, and each bulb contains six to twelve cloves for the next planting. This is seed saving in its simplest form.

Rhizomatous plants — irises, mint, Jerusalem artichokes, comfrey — spread by underground stems that can be cut into sections, each with at least one growth bud, and replanted. Comfrey is so vigorous that even a small root fragment will regenerate into a full plant, which is why it is such a valuable component of chop-and-drop systems: once planted, it is effectively self-propagating and permanent.

See Also

• Seed Saving — the complementary skill of collecting and storing seeds from your own plants
• Perennials First — why investing in long-lived plants justifies the effort of learning propagation
• Food Forest Design — designing systems that benefit from abundant, freely propagated plants
• Pruning Basics — pruning provides the raw material for many cuttings
• Fruit Tree Guilds — communities of plants that can be multiplied through propagation