Brussels sprouts, Jerusalem artichokes, French beans etc


Senior Member
English - British
A punctuation question. When the name of a fruit or vegetable is a compound noun that includes a proper noun, is the latter always capitalised?

Brussels sprouts
Jerusalem artichokes
French beans
Chinese gooseberries

and what about cultivars:
Granny Smiths
King Edwards
Cox's orange pippins etc.?

I'm pretty sure the answer is yes, but I have seen "brussels sprouts" and "jerusalem artichokes" used, especially on the internet.
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