[whtrbt]

Someone posted this link above (https://ulsterlinen.com/flax-to-linen/) which indicates that separating the seed is part of the processing.

[giantg2]

This says there are many opinions in when is best to harvest the fibers, and that they believe it is before the seeds are ripe.

http://hoe-farming.com/growing-and-harvesting-linen-flax/