Isolepis cernua (slender club rush)

Isolepis cernua

Slender club rush

  • Botanical name: Isolepis cernua
  • Common name: Slender club rush
  • Family: Cyperaceae
  • Plant Type: Bog, Marginal, Perennial, Pond, Evergreen
Flower colour:


Foliage colour:


Isolepis cernua, commonly known as the slender club rush, is an evergreen annual or short-lived herbaceous perennial with a wide native range, including most of the continents, where it grows in consistently moist soils.


In the garden, it’s most often grown as a marginal aquatic plant, helping to oxygenate the water, though they can also be grown in bog gardens or container ponds. The elegant foliage is attractive, too, and in summer small creamy-white flowers dot the plant.


For best results, grow Isolepis cernua in full sun or partial shade, as a marginal in a pond or in a bog garden. Tidy up in autumn, but don’t cut the foliage back completely.

How to grow Isolepis cernua

  • Plant size

    30cm height

    20cm spread

  • Aspect

    South facing, east facing, west facing

  • Sun exposure: Dappled shade, full sun, partial shade
  • Hardiness: Hardy
  • Soil type: Boggy / 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 not 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 Divide in May

Do 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

Isolepis cernua and wildlife

Isolepis cernua has no particular known value to wildlife in the UK.

Is Isolepis cernua poisonous?

Isolepis cernua can be toxic.

Toxic to:

Toxic to Cats

Toxic to Dogs

Toxic to Horses

Toxic to Livestock

Toxic to People

No reported toxicity to:

No reported toxicity to Birds

Plants that go well with Isolepis cernua


Myosotis scorpioides

Water forget-me-not