A small cultivated plant.
Ground flax seed it's healthier, and it's good money.
Flax seed oil is derived from flax seed. They both have many benefits of which you can read in the link below. However, flax seed is high in fiber and the oil is not.
flax seed oil. But not limited to. Linen fibre is made from flax.
The amount really depends on how many storms occur during the growing period, and how many storms there are. You would normally get about 1000 pounds