I think a foot tall is big enough, but I would be more afraid of frosts than slugs, bearing in mind recent weather. I wouldn't plant them out until mid-May, but I suppose it depends where you live. Look up some ways of keeping slugs and snails away.
Dordogne and Norfolk. Clay in Dordogne, sandy in Norfolk.
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I think a foot tall is big enough, but I would be more afraid of frosts than slugs, bearing in mind recent weather. I wouldn't plant them out until mid-May, but I suppose it depends where you live. Look up some ways of keeping slugs and snails away.