I’d like to recommend Carol Deppe’s “The Resilient Gardener”, as well as her book “How to Breed Your Own Vegetable Varieties”.
Even if you don’t intend to take up plant-breeding, she has excellent advice about how to save seeds in a way that minimizes inbreeding depression, and how to select for plants that do well in your particular area.
Thanks! At some point it might be worth posting recommended gardening books at the end of an old weekly thread for reference. Something to suggest to Diana maybe.