As it matures, chickweed with its low growing habit will spread out to 40 cm. The round stems are thin, branched and weak being easily broken. The leaves are soft, green and up to 2 cm long. The leaves are in opposite pairs on hairy stalks.
White star-like flowers are produced on slender stalks. The flowers are 1 cm in diameter with 5 deeply divided petals. Chickweed grows very rapidly and can produce seeds within 6 weeks of germination. A plant can produce 10-20,000 seeds.