The Plant-Led Propagation Calendar for 2026: Month by Month in the UK
A propagation calendar is a useful lie. Plants do not read months. They respond to light, warmth, water and the chemical messages that tell a shoot whether to grow or root. But a calendar is still useful because it forces us to look at the same cues at roughly the same time each year.
For 2026, here is a UK propagation calendar built around plant physiology rather than folklore. The dates are prompts. The plant has the veto.
The four signals
Day length is the first. In late winter, lengthening days wake buds before the soil has warmed. In late summer, shortening days begin to ripen wood. A cutting taken into a declining day length is being asked to root while the plant is preparing to slow down. That is why semi-ripe cuttings work in August but softwood cuttings often sulk in October.
Sap movement is the second. In spring, sap is moving upward and growth is pushing. Basal cuttings and softwood cuttings taken from that surge root quickly. In autumn, the plant is withdrawing and hardening. Hardwood cuttings exploit that storage, not the growth flush.
Wood ripeness is the third. Bend a shoot. Softwood snaps cleanly and feels fleshy. Semi-ripe bends and then breaks with a slight snap. Hardwood is tough and does not bend much at all. The right cutting for the season is usually the one that matches the wood, not the one that looks most vigorous.
Soil temperature is the fourth. Softwood cuttings want root-zone warmth, roughly 15–20°C. Hardwood cuttings root in cooler soil, often 5–10°C, but they do it slowly. A cold, wet clay soil in November is not the same as a free-draining sandy soil in the same month.
Month by month in 2026
January. Hardwood cuttings of currant, gooseberry, grape, willow and dogwood. Take sturdy pencil-thick stems, cut below a bud, and push them into well-drained ground or a deep pot. Avoid softwood entirely. In mild spells you can also lift and divide congested perennials, but only if the ground is not frozen or waterlogged.
February. Finish hardwood cuttings before buds break. Divide snowdrops in the green after flowering. Take root cuttings of hardy perennials such as oriental poppy and verbascum if you have a cold frame or greenhouse. This is also a good month to check stored tubers and to pot on rooted cuttings from last autumn.
March. As growth starts, take basal cuttings of delphinium, lupin and other clump-forming perennials. Divide perennials that flower in late summer. Soil is warming but nights are still cold, so use a cold frame or a sheltered windowsill. Avoid taking softwood from plants that have already made soft, forced growth in a heated greenhouse.
April. Softwood season begins properly. Take fuchsia, pelargonium, chrysanthemum and other fast-growing subjects. Leaf cuttings of streptocarpus and begonia can start under cover. Keep humidity high but not stagnant. Avoid softwood cuttings from drought-stressed plants; they often rot before they root.
May. Peak softwood month. Take cuttings from new shoots that are still flexible but not limp. Dahlias, fuchsia, penstemon and many bedding plants root quickly now. Divide spring-flowering perennials after flowering if they are congested. Avoid taking cuttings from plants in full flower unless you remove the flowers first.
June. Softwood continues, but by late June the first semi-ripe material appears. Take cuttings of rosemary, lavender and other woody herbs from the current season’s growth. Leaf cuttings of houseplants are reliable now. Avoid softwood from plants that are wilting in a dry spell; water the stock plant the day before.
July. Semi-ripe season starts in earnest. Take lavender, rosemary, sage, ivy and box. The base of the cutting should be firm, the tip still soft. Keep the cuttings cool and shaded. Avoid taking semi-ripe cuttings during a heatwave; the cuttings lose water faster than they can root.
August. The best semi-ripe window for many shrubs. Hydrangea, choisya, ceanothus and hebe can all be tried now. Bud grafting of fruit trees is possible in mild areas. Avoid overwatering under sealed lids—August heat and damp compost are a mould risk.
September. Finish semi-ripe cuttings early in the month. Divide bearded iris and other spring-flowering perennials. Take root cuttings of primula and other plants that regenerate from root pieces. Avoid late softwood; it will not have time to harden before winter.
October. Hardwood season begins after leaf fall. Take cuttings of currant, willow, dogwood and rootstocks. Divide perennials while the soil is still warm. Take root cuttings of oriental poppy and verbascum. Avoid taking hardwood from plants that are still in full leaf; wait for the wood to ripen.
November. Main hardwood month. Take sturdy cuttings and treat them like small fence posts: firm, deep and well drained. Root cuttings can still be taken if you have protection. Leaf cuttings of some houseplants are possible indoors. Avoid softwood and semi-ripe cuttings outdoors; light and warmth are against you.
December. Finish hardwood cuttings in mild spells. Check stored cuttings for rot. Plan next year’s division and pruning. Avoid propagation outdoors in frost or waterlogged soil. A heated propagator on a windowsill is a better use of December than a soggy bed.
Take this, avoid that
| Plant | Best window | Method | Avoid |
|---|---|---|---|
| Rosemary | July–September | Semi-ripe | Cold, wet November windowsills |
| Lavender | July–August | Semi-ripe | Shade and overwatering |
| Fuchsia | April–June | Softwood | Cold soil before roots form |
| Pelargonium | April–May | Softwood or tip | Sealed, humid lids |
| Ivy | July–October | Semi-ripe | Dry compost |
| Box | July–September | Semi-ripe | Drought stress |
| Hydrangea | July–August | Semi-ripe | Full sun on cuttings |
| Currant | October–February | Hardwood | Waterlogged ground |
| Willow | November–February | Hardwood | Drying out |
| Dogwood | November–February | Hardwood | Poorly drained pots |
| Oriental poppy | February or October | Root | Fleshy, rotting roots |
| Streptocarpus | April–June | Leaf | Cold windowsills |
Regional caveats for the UK
A calendar written in one garden is always slightly wrong in another. In Scotland and northern England, shift the softwood and semi-ripe windows two to three weeks later, and expect hardwood to root more slowly. On the south coast and in mild western gardens, you can bring things forward by a fortnight. Heavy clay holds cold water in autumn, so hardwood cuttings may need a raised bed or a pot of gritty compost. Sandy soils warm faster in spring but dry faster in summer.
The point of a 2026 calendar is not to obey it. It is to notice what the plant is doing. Take the cutting when the wood is right, the sap is moving or the soil is warm enough—and ignore the date if the plant disagrees.
