How to Grow Acaena
iNaturalist
Acaena
Acaena spp.
ground coverAcaena is a genus of low-growing, creeping perennials native to South America, New Zealand, and Australia, prized for ornamental foliage and unusual burr-like seed heads. These hardy plants form dense mats with finely divided, often colorful leaves ranging from green to bronze to red. They are excellent ground covers for rock gardens, alpine troughs, and between pavers.
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Example Acaena timeline · Pittsburgh, PA (Zone 6b)
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Plant Acaena
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Acaena
Around Apr 18≈ 1 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Acaena dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Zones 4-8 are ideal; some varieties tolerate zone 9
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Get my Acaena timeline →Growth Stages
Establishment
4-6 weeksYoung plants develop first true leaves and begin forming shallow root system
Keep soil consistently moist but not waterlogged; provide afternoon shade in hot climates; mulch lightly around base
Vegetative Growth
Several monthsFoliage expands and spreads horizontally; mat becomes denser and more colorful
Water during dry spells; avoid heavy mulching which can trap moisture; foliage colors intensify with sun exposure
Flowering
4-8 weeks in late spring to early summerSmall, inconspicuous flowers appear, often greenish or reddish, held just above foliage
Flowers are not showy; allow them to develop if interested in seed formation; minimal deadheading needed
Seed Development
6-10 weeksDistinctive burr-like seed heads form, often spiny or hooked, adding ornamental interest and potentially sticky when touched
Allow seed heads to mature for ornamental display; seeds spread easily via clothing and animal fur; remove if self-seeding is undesired
Dormancy
2-4 months depending on climateIn winter, foliage may fade or become less vibrant depending on variety; plants slow growth significantly
Reduce watering; avoid stepping on dormant plants; provide good drainage to prevent rot during wet winters
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap if severe; improve air circulation
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Remove affected foliage; ensure good drainage and air circulation; avoid wetting foliage when watering
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Improve soil drainage with sand and gravel; water at soil level only; allow soil to dry between waterings
Uses
Ground cover and rock garden accent
OrnamentalAcaena's mat-forming growth and decorative foliage make it ideal for covering ground in alpine gardens, between pavers, and in rock gardens. The colorful leaves add year-round visual interest. [source]
Unique seed head display
OrnamentalThe distinctive burr-like or spiky seed heads provide unusual ornamental interest in late summer and can be used in dried flower arrangements. [source]
Pollinator support
WildlifeWhile flowers are small and inconspicuous, they attract small insects and bees, supporting local pollinator populations in rock gardens. [source]
Dried arrangements
CraftMature seed heads can be harvested and dried for use in floral arrangements and decorative crafts. [source]
Harvest Tips
Acaena is not harvested in the traditional sense; seed heads can be collected in autumn after maturation if desired for ornamental arrangements or propagation. Foliage can be lightly trimmed to maintain neat appearance in spring.
Fun Facts
- 🌱 Acaena's burr-like seed heads are specifically adapted to catch on animal fur and clothing for dispersal—hikers often carry seeds unknowingly!
- 🌱 Some Acaena species, particularly A. microphylla 'Kupferteppich' (Copper Carpet), develop brilliant bronze or copper-red foliage in cold weather or bright sun, creating a dramatic color change.
- 🌱 The genus name 'Acaena' comes from the Greek word 'akantha' meaning 'thorn' or 'prickle,' referring to the spiny seed heads.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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