1 Packet Of Runner Beans Planted

Question

so why has some plants pink beans and others white

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Answer 1

This is likely from an unstable cross in the generation prior. In order to stabilize the color, it will need to be crossed with another of the color that you would like it to be. This will need to be continued until all progeny are the same color.

https://www.gardeningknowhow.com/edible/vegetables/beans