Flax is a herbaceous plant in the family Linaceae. It is grown for its fiber, which is used to make linen, and for its seed, from which linseed oil is extracted.
Its flowers are borne on the tips of slender stems, and have five petals, usually blue. The fruit is a circular capsule made of five lobes containing the seeds. Flax plants cultivated for fiber can grow up to around 4 ft. (1.20 m) while plants cultivated for seed are shorter.