How to Grow Blue Bidi-Bidi
Wikimedia Commons
Blue Bidi-Bidi
Acaena buchananii
ground coverAcaena buchananii is a low-growing, mat-forming perennial ground cover native to New Zealand, characterized by blue-gray feathery foliage and distinctive red, barbed seed heads. It spreads slowly via creeping stems and self-seeding, creating attractive silvery-blue carpets in rock gardens, alpine troughs, and container gardens. The plant adds visual interest through both foliage color and ornamental seedheads that develop in late summer.
When should you plant Blue Bidi-Bidi in your zone?
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Example Blue Bidi-Bidi timeline · Pittsburgh, PA (Zone 6b)
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Plant Blue Bidi-Bidi
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 Blue Bidi-Bidi
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Blue Bidi-Bidi dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5b-8b; prefers cooler climates and struggles in hot, humid regions
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Get my Blue Bidi-Bidi timeline →Growth Stages
Vegetative Growth
Spring through mid-summer, 3-4 monthsPlant forms dense mat of fine, feathery foliage; spreads laterally via runners; foliage deepens in blue-gray coloration with cool weather
Maintain moderate watering; deadhead spent seedheads if self-seeding is unwanted; allow air circulation to prevent fungal issues
Flowering & Seeding
Late summer to fall, 6-8 weeksInconspicuous greenish-white flowers appear on short spikes; flowers give way to distinctive red, barbed burr-like seedheads that persist for weeks
Leave seedheads on plant for ornamental interest; allow some self-seeding in controlled areas; watch for volunteer seedlings
Dormancy
Winter, 2-4 monthsPlant slows growth and may lose some color intensity in very cold winters; foliage remains evergreen or semi-evergreen depending on zone
Reduce watering significantly; ensure excellent drainage to prevent crown rot in wet winters; no fertilizer needed
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick; use copper barriers or slug traps; encourage natural predators like ground beetles
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Increase humidity around plants; spray with water; use neem oil if severe
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Improve air circulation; avoid overhead watering; apply sulfur dust or fungicide if necessary
Uses
Edible leaves in traditional use
CulinaryIn its native New Zealand, Acaena leaves have been used traditionally in small quantities for beverages and food garnishes, valued for their distinctive color and mild astringent properties. [source]
Ground cover and erosion control
HouseholdExcellent for stabilizing rocky slopes, binding loose soil, and preventing erosion on banks; the low, dense growth habit makes it ideal for terraced gardens and difficult-to-maintain areas. [source]
Ornamental seedheads
CraftThe distinctive red barbed seedheads are prized by flower arrangers and crafters for dried arrangements, adding textural interest and unique color to floral displays and wreaths. [source]
Pollinator and seed dispersal support
WildlifeFlowers attract small insects and pollinators; barbed seedheads disperse via animal fur, supporting natural seed distribution and benefiting small mammals and birds in the ecosystem. [source]
Harvest Tips
Not typically harvested; grown for ornamental foliage and seedheads. Collect seedheads in late summer/early fall if seeds are desired for propagation. Cut back dead or diseased growth in spring. Remove seedheads before they scatter if preventing self-seeding.
Fun Facts
- 🌱 The name 'Bidi-Bidi' comes from the Māori word for the burr-like seedheads, which stick to clothing and animal fur for seed dispersal—a clever evolutionary adaptation.
- 🌱 Acaena buchananii was introduced to European rock gardens in the early 20th century and has become a prized alpine specimen, particularly in the UK and cooler climates.
- 🌱 The blue-gray coloration of the foliage is strongest in cool weather and full sun; the plant may appear less vibrant in warm regions or partial shade.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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