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Leaves, alternate, divided into three partly-folded, deeply cut, heart-shaped lobes. Foliage with sour, acrid taste. Flowers, bright yellow, with five petals, on stalk bent below the fruit attached to a common point. Fruit a narrow “okra-like”capsule. In addition to being an unsightly weed, this plant has been known to harbor pests such as whiteflies and spider mites.

Oxalis has two properties that make it particularly problematical. One is the vigorous network of bulbs that it develops, rendering ineffective, hand or mechanical weeding. Secondly, while most perennial weeds are active during the summer, the primary growing season for Oxalis is the winter.