Due North Garden Tips - Vegetable, fruit and flower growers guid lthough not strictly heirlooms, this is a good source of vegetable information from sowing to eating. I've included this page because it's an unsolicited testimonial for heirlooms, from an average gardener. Sources Where to find seeds and plants. Seed Savers Exchange Seed Savers has been working to find, preserve and distribute heirloom seeds since 1975. They are also a terrific source of current information on gardening advances and set backs.
Members participate in the saving and distribution of seeds.
The web site for this seed company has excellent articles on the whats and whys of heirloom gardening including a comparison of hybrids, open pollinated plants and heirlooms. Perhaps the largest selection of antique fruit trees offered on the web, with excellent reference information on the varieties. Their paper catalog is supposed to be as beautiful as it is enticing. The variety is very good and the prices and small packets allow home gardens to try many different varieties without lots of leftover seed. His site will get you up to speed on heirloom tomatoes.