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Well, 'bean' is not necessarily an exact term. Dehisce (literally 'gape' or 'break open') is the name given to the plants which protect their seeds in a pod of some sort, and which breaks open.

Thus Vanilla, Cocoa, broad beans, runner beans, and peanuts may all be called beans. But that's only my opinion. A botanist would differ no doubt.

A cocoa bean may be the largest in terms of weight, but I couldn't get a figure. My guess would be 1kg perhaps. They would be about one-half the size of a coconut, and contain dozens of small seeds each a little larger than a green pea.

My scarlet runner beans at home will get at least 300mm long if I let them proceed so. Broad beans only get up to 150 - 200 mm in my garden.

I understand that Vanilla beans grow up to 150mm long.

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14y ago

What else can I help you with?