Calamagrostis x acutiflora 'Avalanche'

Calamagrostis acutiflora ‘Avalanche’

Feather reed grass

  • Botanical name: Calamagrostis acutiflora 'Avalanche'
  • Common name: Feather reed grass
  • Family: Poaceae
  • Plant Type: Perennial, Deciduous
Flower colour:



Foliage colour:


Feather reed grass, Calamagrostis x acutiflora, is an upright grass with good year-round interest, bearing feathery plumes in summer and bleached stems catching frost through winter. Its architectural shape lends it to use as a striking focal point in gardens. It can form clumps of stems up to 2m high if grown in moist soil. 


A variegated form of Calamagrostis x acutiflora ‘Karl Foerster’, Calamagrostis x acutiflora ‘Avalanche’ has deep green leaves with a white stripe down the centre – the opposite variegation of Calamagrostis x acutiflora ‘Overdam’. They form a neat clump and turn a buff colour in autumn. produces narrow plumes of feathery, pinkish-green flowers in late summer, which also fade to a buff colour.


Grow Calamagrostis x acutiflora ‘Avalanche’ in moist but well-drained soil in groups in a mixed border, or en masse to form a large, dramatic screen. In early spring, cut it back to around 12cm to allow new growth to emerge.

How to grow Calamagrostis 'Avalanche'

  • Plant size

    1.2m height

    60cm spread

  • Aspect

    South facing, west facing

  • Position in border


  • Sun exposure: Full sun, dappled shade
  • Hardiness: Hardy
  • Soil type: Well drained / light / sandy / clay / heavy / moist

Plant calendar

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Do not Plant in January

Do not Plant in February

Do Plant in March

Do Plant in April

Do Plant in May

Do Plant in June

Do Plant in July

Do Plant in August

Do Plant in September

Do not Plant in October

Do not Plant in November

Do not Plant in December


Do not Divide in January

Do not Divide in February

Do not Divide in March

Do Divide in April

Do not Divide in May

Do not Divide in June

Do not Divide in July

Do not Divide in August

Do not Divide in September

Do not Divide in October

Do not Divide in November

Do not Divide in December


Do not Prune in January

Do not Prune in February

Do Prune in March

Do Prune in April

Do not Prune in May

Do not Prune in June

Do not Prune in July

Do not Prune in August

Do not Prune in September

Do not Prune in October

Do not Prune in November

Do not Prune in December

Calamagrostis 'Avalanche' and wildlife

Calamagrostis 'Avalanche' has no particular known value to wildlife in the UK.

Is Calamagrostis 'Avalanche' poisonous?

Calamagrostis 'Avalanche' has no toxic effects reported.

No reported toxicity to:

No reported toxicity to Birds

No reported toxicity to Cats

No reported toxicity to Dogs

No reported toxicity to Horses

No reported toxicity to Livestock

No reported toxicity to People

Plants that go well with Calamagrostis 'Avalanche'


Miscanthus nepalensis

Himalayan fairy grass
Verbena bonariensis

Verbena bonariensis

Argentinian vervain