We are offering flax seed. Flax is a member of the genus linum in the family linaceae. Flax is grown both for its seeds and for its fiber. flax is an erect annual plant growing to 1.2 m (3 ft 11 in) tall, with slender stems. The leaves are glaucous green, slender lanceolate, 20–40 mm long and 3 mm broad. The flowers are pure pale blue, 15–25 mm diameter, with five petals; they can also be bright red.