Acaena novae-zelandiae

Acaena novae-zelandiae

Pirri pirri bur

  • Botanical name: Acaena novae-zelandiae
  • Common name: Pirri pirri bur
  • Family: Rosaceae
  • Plant Type: Perennial

Native to Australia and New Zealand, pirri-pirri bur, Acaena novae-zelandiae, is a short, creeping plant popular in container planting schemes and rockeries. It forms dense mats of lobed bronze leaves, from which ball-like heads of hooked seeds (burs) appear.


In recent years it has spread to the wild through seed and the dumping of garden material. It is now found in a variety of wild habitats including sand dunes, cliffs, heaths and disused railways, where it poses a threat to native plants. It’s easily spread by seed via its hooked bur, and can be invasive.

How to grow Acaena novae-zelandiae

  • Plant size

    25cm height

    50cm spread

  • Aspect

    South facing, west facing

  • Sun exposure: Full sun, dappled shade
  • Soil type: Well drained / light / sandy

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

Collect seeds
Collect seeds

Do not Collect seeds in January

Do not Collect seeds in February

Do not Collect seeds in March

Do not Collect seeds in April

Do not Collect seeds in May

Do not Collect seeds in June

Do not Collect seeds in July

Do not Collect seeds in August

Do Collect seeds in September

Do Collect seeds in October

Do not Collect seeds in November

Do not Collect seeds in December

Acaena novae-zelandiae and wildlife

Acaena novae-zelandiae has no particular known value to wildlife in the UK.

Is Acaena novae-zelandiae poisonous?

Acaena novae-zelandiae 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