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• American Penstemon Society - join this organization and have available hundreds of species of penstemons.

• Baker Heirloom Seeds - has a beautiful catalog and a wide variety of flower and vegetable seeds.

• Chiltern's Seeds - a British seed company that has a vast selection of perennials, herbs, and heirloom seeds. Ships to the U.S.

• Fedco Seeds - a cooperative venture that lists seeds obtained from organically grown sources; supplies both the farm and home gardener.

• Jelitto's - a German seed company widely used by nurseries, offering a truly huge selection of perennials. Seeds can be ordered in packets (good for the home gardener) as well as in large quantities for the commercial grower. Ships to the U.S.

• Nichols Garden Nursery - another Oregon-based company with a nice selection of vegetables and other seeds.

• North American Rock Garden Society - join this organization and you can participate in one of the most extensive seed exchanges in the world

• Pine Tree Garden Seeds - a U.S. company with a wide variety of seeds

• Plant World Seeds - another British company that ships to the U.S. that has a very good and very extensive selection of perennials and other seeds. Ships to the U.S.

• Sandeman Seeds - a source of seeds from all over the world; a good source for hard-to-find plants. Prices are in British pounds; packet quantities tend to be large. Ships to the U.S.

• Silverhill Seeds - a great source for seeds of southern African plants. Ships to the U.S.

• Territorial Seed Company - an Oregon-based company with a good selection of vegetables and other seeds.

• Willamette Wildlings - a local source of seeds of native plants of the Willamette Valley, Oregon