Plant population size. I have to admit, I never thought about it. I figured, if you want to save seed from your heirloom plants, you just save the seed. I never thought about having a minimum number of plants within a cultivar in your garden in order to have a sufficient gene pool to continue growing healthy plants. Who knew? Well, Seed Savers Exchange knows, and they want to share that information with us. [Above photo credit: www.seedsavers.org] Register for webinar!