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I rely on some 'blue coco' I got 20 odd years ago - lovely ornamental plants, flowers & flat beans - all red/purple. They also cross nicely in a bad year so I get purple tinges in my others, mainly borlotti, helda and pea bean. Most aren't stable though.Cheers.
That's true! If any beans are more prone to crossing than average, it's purple podded types. They make interspecies crosses with Runnerbeans too which are otherwise very rare.
Again dwarf but I am trying Royalty purple pod this year.