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Onion Grass is a perennial grassy weed with between 3 and 10 thin strappy leaves rising from the central base up to 30cm long. The leaves are up to 2mm wide with a prominent central midrib that protrudes to create an almost cylindrical leaf blade in cross section. Flowering in spring, the onion grass plant produces 2-4 small flowers per plant that are positioned around the base of the plant. The flowers are purple in colour with a base and centre, comprising of six lanceolate petals about 10mm in length.