Gadenin日本語Get the appTwo methods, and when each applies
Heuchera gives you two straightforward ways to make more plants, and which you use depends on what the parent looks like. If the clump has split into several arms, each with its own tuft of leaves and its own roots, you divide: pull or cut it into those arms and each becomes a plant immediately. If the plant is a single rosette on a bare woody stem with old dying roots, you take it as a crown cutting: cut the stem off above the useless roots and root the top afresh.
In practice you often do both on the same plant. Lift a four-year-old clump and you find two or three arms with reasonable roots and another two that are all stem and no root. Divide the first group, treat the second group as cuttings, and you turn one tired plant into five.
Seed is possible but rarely worth it. Named heucheras do not come true from seed, and seedlings vary enormously in leaf color, most of them ending up an unremarkable green. Sow it only if you want the variation. It needs light to germinate, so surface-sow onto damp compost, do not cover, and keep it around 64F (18C).
| Method | Best time | What you need | Time to a usable plant |
|---|---|---|---|
| Division of a multi-armed clump | As growth restarts in spring, or early autumn | A clump with two or more rooted arms | Immediate; flowers the same year |
| Crown cuttings from a lifted plant | Spring, or any time in a shaded frame | A firm leafy rosette on stem, roots or not | Rooted in 4-8 weeks, full size in a year |
| Leaf-stalk cuttings | Late spring to midsummer | Healthy outer leaves pulled off with the stalk base attached | Slow; 8-12 weeks and variable success |
| Seed | Late winter under cover | Fresh seed, warmth, light on the surface | Flowering size in the second year, color unpredictable |
Dividing and cutting up the crown
Do this as the plant restarts growth after winter, when it can root into warming soil straight away. Work in the shade, keep everything damp, and have pots and gritty potting mix ready before you start so nothing sits about drying.
- Lift the whole plant and wash it Fork the clump out whole and wash the soil off with a hose or in a bucket until you can see the structure of the crown clearly. You cannot judge where to cut through a lump of soil, and this is a job that depends entirely on seeing where roots come from.
- Pull it apart into arms Work the crown apart with your hands where it separates naturally, using a knife only where the woody tissue will not come apart. Each piece needs a tuft of living leaves and some stem. Roots are a bonus at this stage, not a requirement.
- Cut every piece back to fresh tissue Trim the woody stem of each piece to one or two inches (2-5 cm) below the lowest living leaves, cutting off the old root mass entirely. Check the cut face: firm cream or pale green tissue is sound, brown or hollow tissue means rot or grubs and must be cut away until you reach clean material.
- Strip the old leaf bases Pull the dry brown leaf bases off the stem so bare tissue is exposed, and reduce the remaining leaves to five or six of the healthiest. Cutting the leaf count down means the piece loses less water while it has no roots.
- Pot or plant with the stem buried Set each piece into gritty potting mix or back into prepared ground so soil comes right up to the base of the lowest leaves and the whole cut stem is buried. Firm it in and water. Pieces with good roots can go straight into the border; rootless pieces do better potted where you can control the water.
- Keep shaded and damp for six weeks Stand potted pieces in full shade and keep the compost damp but not sodden. New roots come from the buried stem in three to six weeks. When a gentle tug meets resistance the piece has rooted and can be hardened off into more light.
Do not use hormone rooting powder or a heated propagator for crown cuttings. Heuchera stem roots readily on its own, and warmth plus wet compost around a fleshy stem produces rot far more often than roots.
Leaf-stalk cuttings and awkward cases
When a plant is too precious or too small to cut up, you can take leaf-stalk cuttings from it. Pull a healthy outer leaf away from the crown with a sideways-and-downward tug so a sliver of the stem comes away at the base of the stalk. That sliver is essential; a leaf snapped off cleanly with no base tissue will not root. Insert the stalks around the edge of a pot of gritty potting mix, keep them shaded and covered to hold humidity, and expect roots in eight to twelve weeks with maybe half of them taking.
If a plant has been reduced to one rosette by weevil or rot, treat it as a single crown cutting and give it the best conditions you have: fresh compost, deep shade, steady moisture, no feed. Heucheras recover from surprisingly little. What kills a rescue attempt is usually overwatering while it has no roots, or leaving it in sun so the leaves lose water faster than the stem can replace it.
Pot-grown young plants should be moved on before they get pot-bound and planted out once the root ball holds together when you knock it out. Young heucheras go into the ground very easily, and a first-year plant will usually flower the summer after.
Keeping track of what you made
Label every piece as you cut it, before you pot it. All heuchera crown cuttings look identical for their first month, the leaves that were on them at the time often drop, and color on new growth in shade is not a reliable guide to what the plant will look like in the border. An unlabelled tray of cuttings becomes a lottery.
Write down the date you divided, how many pieces you got, and how many had rooted at the six-week mark. Do that for two or three years and you will know your own success rate and your own best timing, which is far more useful than a general rule. Note as well which parent plants split easily into arms and which came apart only as single rosettes; that tells you which plants in your garden will keep multiplying and which will only ever renew themselves.
Finally, record the fate of the parent. Every division is also a lift-and-replant, so once you have done it you can reset the clock on that plant and put the next lift three years ahead.