But then again, the Welsh have a strange attraction to their vegetables. Such as wearing leeks on their heads.

Common explaination is that it all begin long ago among the Welsh warriors with a misunderstanding.
Just as Welsh warriors at rest were told "Smoke 'em if you got'em" before resuming the march, sgts. told troops, "Right then, all you lazy Taffys take a leek before we step out."
LOL!!!