This a list, incomplete at least, is a good starting place. There are many, many more seed companies and sorting them can become a compulsive hobby. Oh but what fun!
BAKER CREEK HEIRLOOM SEEDS; www.rareseeds.com 2278 Baker Creek Road Mansfield, MO 65704; 417.924.8917 What a catalog! Beautiful pictures of the produce – vegetable porn for sure. I have found many off the wall and obscure seeds I've ordered from them. They are often the only source for some of these seeds. Anyone who works this hard in putting out a beautiful seed catalog is working with a great deal of love. Drooling is hardly optional here.
PEACEFUL VALLEY FARM SUPPLY; www.groworganic.com PO Box 2209; Grass Valley, CA 95945; 916.272.4769 I have purchased many seeds (and a lot of other things!) from Peaceful Valley – I love their catalog. They have an excellent selection of cover crop seeds as well as a lot of organic gardening supplies and tools. I have used their catalog to teach organic gardening because they clearly explain their products and how to use them. They are easily accessible for answering questions.
NATIVE SEED/SEARCH; www.nativeseeds.org 526 N. 4th Ave. Tucson, AZ 85705; 520.622.5561 (Fax 520.622.5591) Specializing in the seeds of seeds of south western United States, concentrating on the ancient seeds of the First Nations People from amaranth to watermelon, a lot of them from the O'odam lineage. A worthy cause for your money. And good seed – some amazing varieties found no where else.
PINETREE GARDEN SEEDS; www.superseeds.com PO Box 300, Rt. 100; New Gloucester, ME 04260; 207.926.3400 Probably the best for a home gardener – small packets of very current seed and some open pollinated varieties, a very good value. The smaller packets mean a smaller price so a person can order a lot more varieties and experiment. I have been a customer for many years.
SEED SAVERS EXCHANGE; www.seedsavers.org Rt. 3 Box 239; Decorah, Iowa 52101; 563.382.5990 Membership fee $35. (You need not be a member to order seeds.) Free brochure. Some organic, but ALL open-pollinated. There are two ways to save seeds: one is to collect them all and keep them in a huge building that protects them from everything up to (and including) nuclear holocaust. The other way is to grow 'em. You can find the chance to grow them here. I have been a member for about 10 years and believe in their work.
SOUTHERN EXPOSURE SEED EXCHANGE; www.southernexposure.com P.O. Box 460, Mineral, VA 23117, 540.894.9480 (Fax: 540.894.9481) A commercial venture that is somewhat similar to Seed Savers Exchange, but really isn't an exchange. They do carry seed saving supplies - nice to have if you are going to save seed. And they sell some pretty different varieties. While they are in Virginia, most of their plants will do fine in our climate.