“HPSW is a grass-roots educational organization interested in the conservation, propagation, dissemination, and use of hardy herbaceous perennials in the landscape.” The HPSW website has information about upcoming events and meetings, how to join, a list of seeds in their seed exchange and a list of member benefits.
Keyword: Plant and garden societies--Pacific Northwest
North Coast Chapter of California Native Plant Society
Covers only the northern-most part of California