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That's not quite an accurate description. Strains do have to be several generations old to be considered heirloom but many have been hybridized over the centuries to get to what they are today. Heirloom's are supposed to produce "pure" offspring but because heirloom plants are free pollinated, they can produce "off" products. Melons, squash, and cucumbers are the worst for crossing naturally (through wind and bugs) but tomatoes and beans can be crossed on accident too. They also are NOT more resistant to bugs in any way at all. Most are MORE susceptible to bugs and disease ... that's usually why they are hybridized in the first place - to make them more resistant to disease.
Hybridized plants are not the same as GMO products. Monks in the twelfth century were hybridizing plants ... almost nothing we grow today is a "pure" and original plant given the many centuries of gardening that have gone on before us. GMO is done in a laboratory and adds genes from non-plant products to the plants, like chemicals to kill bugs. Hybridizing is done in the field or greenhouse by taking pollen from one plant and introducing it to another plant, exactly like bees or the wind would do. Hybrids and heirlooms are both completely natural products.
There are several non-GMO seed companies out there with great products. Territorial seed and Cook's garden are the two we like best and over 20 years of gardening have had the best and most consistent success with even during trying weather conditions. Last year was our first year to use Baker Creek and we were horribly disappointed with them. Almost nothing grew and the things that did didn't produce the products they were supposed to produce ...