Cross pollination of Beans
A couple months ago I was speaking with Glenn Drowns (Sandhill Preservation Center) and mentioned how crossing between my beans has taken a real upturn in recent years. He enlightened me with a bit of information that I have been needing to share. It turns out that, when conditions are hot and dry, bean flowers open wider, allowing for easier pollination by insects.
I guess this translates to being more wary when years are hot and dry. But I'm still going to reduce the number of varieties I grow in a given year, spread them farther apart, and grow in larger blocks, taking seed from the middle of a given block.