Hello,
Some uses, so many uses. The plant itself, either alone or as a crop is attractive as can be seen.
So I like putting it in for no other reason than that. It is not easy to get started though because it must be kept weed free in the beginning. If you live where it's wet with a lot of rain like me you won't get a high quality crop, but still, its worthwhile.
The dried stocks themselves are useful as reinforcement if you are putting down a clay floor instead of other less mentionable reinforcement there.
Also for other clay plasters the chaff is ideal for putting in as a filler, insulator, and strengthener.
Extracting the long fibers opens up all kinds of other possibilities. If I want some rope that is very strong I can twist or braid some of these fibers together. Separating some of these fibers I can wrap them around a threaded pipe connection, screw it together and ensure it will not leak. Sometimes it can take time for the fibers to swell and seal the leak so you have to wait but with the certainty that t will stop the drips. And unlike that silicone tape, if you have to unscrew the connection, no need to rewrap with new flax, just screw it back together and it will work. It must be possible to spin some nice thread, then to be woven, if you possess those skills.
And then you have the seed, ok, save some for replanting and press the rest for oil and all that you can do with that.
Good for making paint, like this I put on my wheelbarrow.
or mixing with lime for window glazing.
Oh, to much to go on...
Greetings,
Don Wagstaff