At a glance
- Vegetative propagation gives you true-to-type copies of your favourite plant; sowing seed gives you genetic surprises.
- Four routes cover almost everything: cutting, division, runner, layer. The plant usually tells you which one fits.
- Soft herbs and shrubs go via cuttings, perennials via division, strawberries and mint do the work themselves with runners.
- Woody shrubs that sulk as cuttings almost always root as a layer on the mother plant.
- The most common mistake is not lack of talent but too much wet: rot kills more cuttings than anything else.
There is that moment in the garden when you stand in front of a plant that simply does everything right. The rosemary that survives every winter. The mint that tastes exactly right. And then the thought arrives: I would love three more of those. You do not have to buy anything for that. Almost every plant in the bed can be propagated yourself with a few simple moves, and the result is not a random relative but a real copy. This overview shows you the four routes and helps you decide which one fits which plant.
Why propagate yourself instead of buying
The most important difference lies in the genetics. Sowing seed is generative propagation: two parent plants mix their genes, and the offspring are a lottery. That is exciting for something new, but unreliable when you want exactly this one variety. Many varieties are crosses whose seed does not come true. From the pip of your favourite apple variety, that same apple will never grow again.
Vegetative propagation takes the other route. You take a piece of the mother plant, and it becomes a genetically identical clone. True-to-type is guaranteed because no foreign genes come in. The second advantage is speed: a rooted cutting is often a sturdy plant in its first year, while sowing sometimes takes years until the first harvest. And the third advantage is simply money. A handful of cuttings replaces a whole trip to the garden centre.
The best plant for your garden is usually already standing in it. You just have to divide it.
Old gardener's rule
The four routes at a glance
Sounds like a lot of technique, but at heart it is simple. Almost everything you want to propagate in the home garden runs through one of these four routes. Which one fits depends on how the plant grows, not on your skill.
- Cutting
A cut piece of shoot or leaf forms new roots. The classic for herbs, perennials and many shrubs.
- Division
The root ball of a clump-forming perennial is split into several pieces with a spade or knife. Rejuvenates and multiplies in one step.
- Runner
The plant produces finished daughter plants on its own runners. You only have to separate them and plant them.
- Layer
A shoot is bent down to the ground and roots there while still attached to the mother. Ideal for shrubs that struggle as cuttings.
Cutting: the quick classic
The cutting is the entry point for almost everyone. You cut a healthy shoot, remove the lower leaves and put it in water or moist substrate until roots appear. Soft herbs like basil or peppermint often root in the water glass within one to two weeks. Semi-woody candidates like lavender, rosemary or currants need substrate and a bit more patience, but they are robust in return.
Choose a shoot
Take a strong, non-flowering side shoot of 8 to 12 cm length. Flowering shoots put their energy into the bloom, not into roots.
Cut cleanly
Cut directly below a leaf node. That is where most of the root-forming tissue sits. A sharp, clean knife prevents crushing.
Remove lower leaves
Pluck off the lower third of the leaves. Whatever lies under water or in the substrate would otherwise rot. Halve large leaves to slow evaporation.
Let it root
Into the water glass on a bright windowsill or into moist seed compost. Not in blazing sun. Keep the soil evenly moist, never wet.
Pot on
As soon as the roots are 2 to 3 cm long, into a small pot with lean soil. Water-rooted cuttings now first have to get used to soil, so water more often at the start.
For herbs to harvest you do not need rooting powder. Soft shoots form roots by themselves. Save the hormone powder for difficult woody plants.
The best time for herb cuttings is spring through high summer, roughly CW 18 to CW 32, when the plants are in full growth. A cutting in autumn can still work, but it needs a bright, frost-free winter quarters, because it will not become a sturdy plant before spring. When in doubt, set a few cuttings too many, because a portion is always lost, and that is entirely normal.
Division: rejuvenate and multiply at once
Clump-forming perennials go bare and woody in the middle over the years. That is exactly when dividing is due, and in the process several plants emerge from one. You dig up the ball, shake off the soil and split it. Small, soft clumps can be pulled apart by hand; tough rootstocks like rhubarb you separate with the spade. Every division needs roots and at least one bud or eye.
The best moment depends on flowering: divide spring bloomers after flowering, summer and autumn bloomers in early spring, roughly CW 10 to CW 14, when they are just breaking bud. Mint and many other herbs are forgiving here and can be divided almost all year. Anyone growing a rampant peppermint in a pot can simply slice through it at the annual repotting and immediately has two plants.
Dividing is not an emergency operation but care. Many perennials even flower more willingly after division, because the rejuvenated clump gets room and fresh soil again.
Runner: when the plant does the work
Some plants propagate practically by themselves and send out runners with finished daughter plants at their ends. The best-known example is strawberries: from summer they form long runners, and where a daughter plant touches the ground, it roots in. You only have to hold it in place, let it root and then separate it from the mother.
It works most reliably when you guide the strongest first daughter plant per runner into a small pot filled with soil that sits in the ground next to the mother. Fix it with a wire clip or a stone, keep the soil moist, and after two to three weeks it has its own roots. Only then do you cut the connecting runner. Best time is high summer, roughly CW 26 to CW 33, so the young plant is strong enough by winter.
Not only strawberries do this. Many ground covers, spider plants and some herbs form runners too. The principle stays the same: wait until the daughter has its own roots, and only then cut through. Cut too early and instead of a new plant you have only a wilting tuft of leaves.
Fragaria × ananassa
- Familie
- Rose family
- Standort
- Sunny to partial shade, humus-rich soil
- Saison
- Runners in high summer · CW 26 to CW 33
- Wasserbedarf
- Evenly moist, avoid waterlogging
- Frosthärte
- Hardy, down to about -15 °C
Layering and air layering: the trick for shrubs
When a shrub refuses to root as a cutting, layering almost always helps. Instead of cutting a shoot off, you bend a low, flexible branch down, nick it slightly at the contact point and cover it with soil. The shoot stays on the mother, so it keeps being supplied, and forms roots at its leisure. That is what makes the method so reliable. Currants, gooseberries, hazel and many ornamental shrubs work with ease this way.
For shoots that cannot be bent to the ground, there is air layering. You nick the shoot up high, pack moist moss or substrate around the spot and wrap the whole thing airtight with film. In that moist parcel the shoot forms roots, and after a few weeks to months you can cut it below the roots and plant it. A little patience, but an almost sure thing even with fussy woody plants.
Ground layers are best set in spring or early autumn, when the soil is warm and moist. Until the layer is strongly rooted through, a whole season can pass. This is not a method for the impatient, but one for people who like to watch.
Which route for which plant
The decision is easier than it sounds. First ask yourself how the plant grows, and the route almost falls out by itself.
- Soft herbs and perennials (mint, basil, sage): cutting in the water glass or division. Both work almost all year.
- Clump-forming perennials (rhubarb, daylily, ornamental grasses): division in early spring. Two birds with one stone, because you rejuvenate at the same time.
- Plants with runners (strawberry, spider plant): runners. The plant delivers the finished young plant free of charge.
- Berry and ornamental shrubs (currant, gooseberry, forsythia): cutting in autumn or layer. If the cutting refuses, the layer settles the matter.
- Difficult woody plants (thicker, unbendable shoots): air layering. More effort, but the safety net for everything else that fails.
The biggest enemy of fresh cuttings and runners is not drought but rot from waterlogging. If the substrate stands under water, the young roots rot before they properly take hold. Better evenly moist than sopping wet, and always provide drainage holes in the pot.
Before you start
Propagating is not precision craftsmanship with a success guarantee, but a numbers game with a high hit rate. Set a few more cuttings than you need, work with clean tools so no fungi get introduced, and give the young plants time. When your home-grown plants are due to go outside, get them used to sun and wind slowly, so they survive the move into the bed well. The nicest part comes at the end: a plant you raised yourself grows differently in your mind than a bought one. It belongs a little more to you.
Common questions about plant propagation
What is the difference between sowing and vegetative propagation?
When sowing (generative), the genes of two parent plants mix, and the offspring do not always come true to type. In vegetative propagation (cutting, division, runner, layer) a genetically identical clone of the mother plant emerges. If you want to keep exactly this variety, the vegetative route is the right one.
Do you really need rooting powder for cuttings?
No. Soft herbs and perennials root without any aids, often in the water glass already. Rooting powder with hormones only helps with difficult, woody plants that are reluctant to form roots on their own. For the home garden it is mostly dispensable.
When is the best time to propagate?
That depends on the method. Herb cuttings succeed in spring through high summer (about CW 18 to CW 32), perennials you divide in early spring or after flowering depending on bloom time, strawberry runners you take in high summer (CW 26 to CW 33). Layers you set in spring or early autumn. Basic rule: propagate when the plant is in active growth.
Why do my cuttings keep rotting?
Almost always too much wet is the cause. If the substrate stands under water or drainage holes are missing, the young roots rot. Keep the soil evenly moist, never sopping wet, remove the lower leaves so nothing festers in the water, and use clean tools so no fungi get introduced.
Can I propagate supermarket herbs?
Yes, often surprisingly well. A pot of basil or mint from the supermarket can be split into individual cuttings that form new roots in the water glass. That way you turn one weak supermarket plant into several sturdy garden plants, with no new purchase at all.
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