It is when you eat it
I think lettuce is not a inanimate noun. Cassini Burks
isn't lettuce a living organism?
it is a living organism, but it does not breathe and it has no perceptible pulse
Look! There goes that damned lettuce again, careering round the garden like a maniac. Oi!! lol
(Apologies for using 'lol' here, but I really was :-)