Aceana inermis purpurea - Purple Bidibid
DESCRIPTION & SIZE GUIDE
Acaena inermis ‘Purpurea’, commonly known as the Purple Bidibid, is a low-growing, mat-forming New Zealand native prized for its rich purple foliage. It typically spreads 0.5 - 1 metre wide while staying under 10 cm tall, creating a dense carpet effect that softens hard edges and fills gaps between pavers, rocks, or larger plants. With its striking colour contrast, it is widely used in modern garden design, mass plantings, and as a weed-suppressing groundcover. For best coverage, space plants 30 - 40 cm apart in groupings, or closer in high-traffic landscaping projects where quick establishment is desired. Its vibrant foliage intensifies in cooler months, adding year-round interest.
ECOLOGICAL BENEFIT
As a hardy native groundcover, Acaena inermis ‘Purpurea’ contributes to soil stability and helps reduce erosion on exposed or sloping sites. Its dense mat reduces weed competition, creating a healthier, more sustainable planting environment. While it does not produce showy flowers or fruit, its small burr-like seed heads can provide minor habitat resources for insects and ground invertebrates. By choosing this native over exotic groundcovers, you help strengthen New Zealand’s biodiversity and maintain genetic integrity within designed landscapes. It’s also an eco-conscious alternative to thirsty exotic lawn substitutes, offering both resilience and visual appeal with minimal inputs.
GROWING CONDITIONS & CARE
Acaena inermis ‘Purpurea’ thrives in full sun to partial shade and prefers well-drained soils. It is tolerant of both dry and exposed sites, making it highly suitable for rock gardens, coastal gardens, and urban landscaping. Once established, it requires little maintenance and has excellent drought tolerance, though occasional watering during dry spells will maintain lush growth. This plant copes well with light foot traffic and seasonal frosts, making it versatile across many New Zealand regions, including West Auckland’s varied conditions. For best performance, plant in groups, apply mulch when young to conserve moisture, and trim back lightly if growth becomes too woody or open.
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