Broad beans (favas / bondebønner) will easily cross with other varieties that are growing nearby. In order to keep a variety pure, you need to isolate them physically. I like to have different varieties with different coloured flowers and bean colour in additon to maintaining early yielding varieties such as Express. I’ve found that I can plant different forms close together and if I save separately beans with different colour and bean size and mark for saving plants with particularly nice flower colours, then I can maintain a good mix in the same place. The flower forms below are all growing within a few metres in the Væres Venner community garden. They were grown from the mix of beans saved at the same place in 2018 (first picture). I don’t offer the different forms as named varieties, but as a mix or composite “Væres Venner Mix” so that others can also select for separate forms! Bumble bees were all over the flowers when I was there!