A quick gurgle shows:
They aren't the same species as cultivated leeks, which are Allium
porrum, and which is not known to occur (as such) in the wild.
However, there is a wild allium with which they are interfertile;
I have no idea why they aren't described as a mere cultivated form
of that. It's native to the Near East.
Don't think it's a diameter problem really, except diameter has a
relationship with length. (Usually the greater the diameter of the leek,
the greater it's length. This is the way I've seen it presented in
books. Basing it on length would avoid the confusion that we are
discussing now.) You want 5 - 6 inches of the plant in the ground to
produce the blanched (white) base of the leek.
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