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HPSO: Celebrating 33 years of serving gardeners. We make the world a better place through horticulture.
The Hardy Plant Society of Oregon is a community of passionate gardeners at all levels. The Society offers an extraordinary array of educational programs and activities year-round. With now over 2400 members, HPSO is one of the largest non-profit gardening organizations on the West Coast.
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The Hardy Plant Society of Oregon, commonly known as HPSO, is a non-profit volunteer organization for all gardeners: beginning or experienced, amateur or professional. Founded in 1984 and dedicated to the promotion of hardy herbaceous perennials, the Society now has over 2,500 members throughout the Pacific Northwest and beyond.
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