We love beans and grow many varieties every year. Please note that bean diversity is a greater priority for us than absolute varietal purity. We isolate species that generally cross-pollinate, but some plants such as beans which are self-pollinating, are not always isolated from each other. For this reason you may find some crossing (usually less than 1%). Bean crosses are easy to identify, and if you choose to save seed yourself, you can often clean up the genetics in one generation by not planting out the off-types. Or, grow the off-types and start your own new bean variety! That being said, our bush snap beans usually do not have any off-types; they are not as promiscuous.