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BiologyChickweed occurs either as an annual species or as a short-lived perennial (3), and produces several generations a year, each one flowering after just 5 weeks of growth (1). It can remain green and often in flower throughout winter (4). The flowers are visited by many small flies and bees (2). A single plant may produce around 2,500 reddish-brown seeds, which can remain viable in the soil for 25-40 years (1). Common chickweeds is highly prized as a food for poultry and cage-birds, and even for humans in small quantities as a vegetable of stir-fries and salads (4).