Blechnum penna-marina

Blechnum penna-marina

Alpine water fern

  • Botanical name: Blechnum penna-marina
  • Common name: Alpine water fern
  • Family: Blechnaceae
  • Plant Type: Perennial, Evergreen
Foliage colour:


Alpine water fern, Blechnum penna-marina, forms a carpet of attractive slender fronds, which emerge bronze-red and mature to a fresh green. Shade loving and evergreen, it makes fantastic ground cover in a woodland border. 


Grow Blechnum penna-marina in moist, acidic soil in full to partial shade. Keep well watered during the growing season. 

How to grow Blechnum penna-marina

  • Plant size

    30cm height

    100cm spread

  • Aspect

    North facing, east facing

  • Position in border


  • Sun exposure: Partial shade, full shade
  • Shade type: Damp
  • Hardiness: Hardy
  • Soil type: Clay / heavy / moist / acidic

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 not Plant in March

Do not 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

Blechnum penna-marina and wildlife

Blechnum penna-marina has no particular known value to wildlife in the UK.

Is Blechnum penna-marina poisonous?

Blechnum penna-marina 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 Blechnum penna-marina