Acaena microphylla, commonly known as bidibid, pirri-pirri, or New Zealand burr, is a hardy, low-growing perennial groundcover native to New Zealand that is appreciated for its fine-textured foliage and interesting seasonal display. This mat-forming plant spreads across the ground with creeping stems, producing a dense carpet of tiny, fern-like, pinnate leaves that range from fresh green to bronze or reddish tones depending on the variety and season, giving it a soft but colorful presence in the landscape. In summer, it bears small clusters of inconspicuous flowers that are quickly followed by distinctive spherical burrs covered in hooked spines or barbs, which ripen to shades of red, copper, or burgundy and stand out vividly against the foliage. While visually striking, these burrs have a notorious habit of clinging to clothing, animal fur, and wool, which aids in seed dispersal but can be a nuisance in garden settings. Despite this trait, Acaena microphylla is valued in horticulture for its ability to form dense, weed-suppressing mats, making it an attractive choice for rock gardens, slopes, and between stepping stones where its resilience to foot traffic is a bonus. It thrives in well-drained soil, full sun to partial shade, and once established, requires little maintenance, tolerating periods of drought and poor soils. Compact yet vigorous, it brings a natural, textured element to landscapes and is often planted as an alternative to traditional lawns in challenging sites. With its combination of intricate foliage, seasonal color shifts, and ecological role as a native groundcover, Acaena microphylla is both a practical and ornamental plant, embodying the rugged charm of New Zealand’s flora.