Creeping Oxalis

Creeping oxalis is a low-growing, mat-forming perennial weed with a taproot and creeping, rooting stems that spread outwards from the crown. Each leaf is divided into three heart-shaped leaflets on a slender stalk, resembling clover, and ranges from bright green to purplish-bronze depending on the variety and growing conditions. Small five-petalled yellow flowers appear from spring through to autumn in mild areas, followed by narrow, upright, cylindrical seed pods that split explosively when ripe, flinging seed well away from the parent plant.

It belongs to the Oxalidaceae family and is widespread across Australia in lawns, garden beds, pathways, and pots. It thrives in a wide range of soils and conditions, tolerating both full sun and part shade, and is particularly persistent in irrigated turf, garden borders and container plants where soil is regularly disturbed or kept moist.

Growth is most vigorous during the warmer months but it can persist year-round in temperate and subtropical regions, often surviving mowing and light cultivation due to its low growth habit and deep taproot. Seed can remain viable in the soil for extended periods, allowing new plants to emerge long after the original infestation appears controlled.

Management relies on a combination of approaches: maintaining a dense, healthy lawn or garden bed to reduce bare ground and light penetration, hand removal of young plants before seed pods form (taking care to remove the taproot), and mulching garden beds to suppress germination. Because of the explosive seed dispersal and persistent seed bank, ongoing monitoring over several seasons is usually needed to bring an established infestation under control.