Actaea racemosa 

About this cultivar:

Actaea racemosa is a North American woodland native, commonly called Black Cohosh, with clusters of small, white flowers carried well above the bright green leaves. The flowers are followed later in the season by interesting dry brown seed heads. The specific epithet, racemosa, refers to the flowers being produced in racemes. Has the RHS AGM. 

Not just for woodland, great at the back of a border!

• Position: Full sun, partial shade (better in partial shade)
• Soil: Almost any soil (that isn't too dry) - grows well in Ballyrobert!
• Flowers: August, September
  
• Other features: Royal Horticultural Society Award of Garden Merit (RHS AGM)
• Hardiness: H7 - Hardy in the severest European continental climates (< -20°C), Fully hardy - grows well in Ballyrobert!
• Habit: Bushy, Columnar or Upright
• Foliage: Deciduous
• Height: 105 to 150 cm  (3.5 - 5 ft)
• Spread: 60 to 90 cm  (2 - 3 ft)
• Time to full growth: 2 to 5 years
• Plant type: Herbaceous Perennial
• Colour: White, green
• Goes well with: Ferns (Dryopteris, Polystichum and Polypodium), Heucheras and glossier grasses such as Hackencloa. Rodgersia, Anemones, Fuchsias, Hydrangeas.

About this genus:

Actaea are herbaceous perennials, many of which were known as Circimifuga from 1732 (when John Bartram discovered the plant) until 2000 when DNA evidence discovered Circimifuga were also Actaea. Whatever you call them, Actaea have a majestic frame - tall and graceful - with dark straight stems. The leaves are often matt shades of the dark bronze-black-brown, but can also be glossy or green.

Depending on the cultivar the fragrant flowers can be delicate white, cream or pale pink, and are tightly packed on dreamy spikes. This foliage, flower, and fragrance combination undoubtedly makes it a favorite in our garden at Ballyrobert and we think it should be in every garden.

You're often told Actaea prefer part shade or full shade and thrive in cooler, moist areas. However we grow one in an old bath in the middle of our yard! (I think by definition the climate in the British Isles is never full-sun). If too dry their leaves scorch, if too sunny the leaves bleach. Difficult to propagate since they don't like being disturbed and are quite slow growing. The simplex species tends to flower in later Autumn. The Atropurpurea Group typically have purple to bronze tinted foliage

In the garden Actaea tend to be used for their foliage and look great mixed with other foliage plants such as ferns (Dryopteris, Polystichum, and Polypodium), Heucheras, and glossier grasses such as Hakonechloa. Flower-wise Actaea also work well with Anemones, Fuchsias, and even some Hydrangeas.