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ziq OP wrote (edited )

Reply to comment by yaaqov in Natural rubber from dandelions by ziq

I let my collards and kales self seed and they remain collards and kales generation after generation. They don't seem to readily cross pollinate with the wild mustards that grow nearby, but it is possible to hybridise them so I imagine they'd eventually revert to a wild form:

http://www.brightseeds.co.uk/products/utopia_mustardkale_hybrid_gamecover/56/

https://www.vox.com/xpress/2014/8/6/5974989/kale-cauliflower-cabbage-broccoli-same-plant

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