What is the difference between linen and flax?

Answer 1

Other than the letters used to spell them... Quite a lot.

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Answer 2

Flax is the plant from which linen is made.

The flax is cut at the base, the leaves stripped and the stems left to soak in water until the outer stalk covering rots away and is separated from the long inner fibers. These are then spun into thread, then woven into cloth.