(1) flax for fiber. The plant height is 70 ~ 120cm, the stem is smooth, the stem diameter is 1.5mm ... The fiber content is 20% ~ 35% regardless of the stem. There are 4 ~ 5 branches and 5 ~ 8 capsules. The growing period is 70 ~ 100 days in North China and 130 ~ 180 days in South China.
(2) flax for oil and fiber. The plant height is 60 ~ 90 cm, sometimes it has branches, the inflorescence is more developed than fiber flax, and there are many capsules per plant. Its main characteristics are between oil flax and fiber flax, and its cultivation purpose is to give consideration to both seeds and fiber. Seed yield and 1000-grain weight are higher than fiber flax. The 1000-grain weight is 6 ~ 9g, and the oil content is 35% ~ 45%. The stem fiber content is 15% ~ 20%.
(3) flax for oil pressing. The plant height is 40 ~ 60 cm, the growth period is 70 ~ 120 days, and there are many branches, each plant has 10 ~ 30 grains, and at most 100 grains or more. 1000-grain weight is 7 ~ 16g, and oil content is 40% ~ 48%.