I stumbled across Seattle Tilth on a walk through my neighborhood - they run an experimental garden on the grounds of the Good Shepherd Center in Wallingford - and have been a fan ever since. They're an education-oriented non-profit, and offer a wealth of local and national resources for help with planning, creating and maintaining organic gardens. They also organize an excellent heirloom plant sale in early spring (where I typically buy most of my vegetable starts). They're worth supporting through membership, but whether or not you join, they're a great place to start to learn more about how to garden responsibly.
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