Actaea racemosa
Black cohosh
Common names: Black bugbane, Black snakeroot
At a glance
- Light
- Partial shade
- Lifespan
- Perennial
- Flowering
- Jul–Sep
- Hardiness
- Hardy
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Description
Black Cohosh (Actaea racemosa) produces long, fragrant white flower spikes from July to September, resembling small white torches in shaded garden corners. It thrives as a shade perennial at woodland edges or beneath light trees where the soil remains moist and humus-rich. With a height of 120 to 180 cm, it provides a stately accent even in late summer when many other perennials have faded. The plant is toxic; roots and later red berries can cause gastrointestinal distress if ingested, so keep it out of reach of children and pets. Root preparations should only be made by qualified professionals and never used in home cooking.
Care instructions
Plant in spring or fall in loose, humus-rich soil and keep it consistently moist, dry periods are undesirable. A semi‑shaded spot under a light leaf canopy best mimics its natural habitat and protects the delicate flower spikes from harsh midday sun. In spring, add a layer of compost or leaf mulch to retain moisture and supply nutrients for the entire summer. After flowering, you may leave the spent stems; they remain decorative into winter and provide shelter for insects. Once established, Black Cohosh is low‑maintenance and tolerates occasional missed watering as long as the overall site stays sufficiently moist.
The care notes were machine-translated from German.
Garden year
FloweringJul–Sep
Soil & site
Soil pH
Soil type
humus-rich, moist, nutrient-rich, well-drained
Black cohosh comes from light deciduous woodland in North America and therefore likes humus-rich, evenly moist soil with a good supply of nutrients. It does not tolerate waterlogging, and dried-out sites are met with drooping leaves. A spot with loose, deep soil and some leaf mulch as a covering layer comes closest to its natural habitat.
Feeding
Medium feeder
Months
Apr, Jun
In spring black cohosh welcomes a helping of compost, which you work shallowly into the top layer of soil. A second, light helping in early summer supports the development of the tall flower spikes. It needs no more; it is an undemanding woodland perennial that benefits more from organic mulch than from frequent feeding.
Overwintering
Black cohosh is hardy in Central Europe and withdraws completely into the ground in autumn after flowering. You can leave the wilted stems standing until growth starts in spring; they offer insects shelter and protect the buds on the rootstock from frost. A mulch layer of leaves does good in the first winter after planting; after that the perennial is robust even without extra protection.
Propagation
Methods
- Division
- From seed
The most reliable way to propagate black cohosh is by division in early spring or autumn, when the perennial is several years old and well established. Dig up the rootstock carefully and divide it with a sharp spade into pieces, each with at least one growth bud. Sowing also works, but needs patience, as the seeds need a cold spell to germinate and the young plants only flower after several years. After dividing, keep the new sections evenly moist until they are well established.
For your garden
Grow Black cohosh yourself
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