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Northwest  Perennial  Alliance

Sharing a Passion for Gardening
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About Us

The Northwest Perennial Alliance, or NPA, is a non-profit volunteer organization for everyone who is passionate about gardening in the Pacific Northwest. We are devoted to teaching, inspiring, and sharing the joy of gardening.

With our popular Open Gardens program and network of neighborhood garden groups, NPA is a wonderful way to meet other gardeners and learn about plants that survive and thrive in our climate.

  • Founded in 1984
  • Over 2,000 members
  • Members from Bellingham to Olympia and beyond
  • Bellevue Botanical Garden 'Garden Partner' since 1992
  • The NPA is a tax-exempt, 501(c)3, non-profit educational organization, incorporated under the laws of the State of Washington

Why Join NPA?

  • Fun and friendships with fellow gardeners!
  • Free inspirational garden tours
  • Fantastic neighborhood garden groups
  • Free lectures that educate and inspire
  • Discounted gardening classes and workshops
  • Hands-on learning at the NPA Border
  • Specialty plant sales
  • Free Perennial Post newsletters
  • Discounts at many local gardening businesses


Donations support NPA's education programs.

  • Lectures, Classes, and Workshops
  • The NPA Border at Bellevue Botanical Garden
  • Student Scholarships and Internships 

NPA also accepts donations of healthy plants for the NPA Border.

See DONATE for more information.

Leadership Team

The NPA Leadership Team manages all Programs and Activities:

  • Board of Directors
  • Project Chairs
  • Program Committees

See LEADERSHIP TEAM for more information.


The NPA is managed by volunteers who benefit from the shared experience of working with fellow plant lovers. Volunteering is the best way to learn more about gardening and make new gardening friends!

See VOLUNTEERS for more information.

Our Mission

The Northwest Perennial Alliance (NPA) is an organization of ardent gardeners with a passionate devotion to herbaceous plants. Members comprise a wide range, professional to amateur, but all with the aim of furthering gardening in the Northwest.

NPA is organized primarily for educational purposes, which includes:

  • The advancement of knowledge and education of gardeners  through lectures, garden tours, the NPA Border at Bellevue Botanical Garden (BBG), literature and other educational programs
  • The advancement of the culture, study and availability of hardy herbaceous plants
  • The conservation of rare, old and lesser-known hardy herbaceous plants

What is a perennial?

The Northwest Perennial Alliance is often asked this question! Our organization was formed in 1984 by a group of passionate gardeners who wanted to promote the use of perennial plants to add to their mixed plantings of trees, shrubs, and annuals. They helped bring perennial plants to the attention of NW gardeners and growers, resulting in the expanded plant selection found today! 

The term ‘perennial’ describes plants that live more than two years, excluding trees, shrubs and bulbs. There are three commonly referred to types of perennial plants:

  • Herbaceous Perennials grow from their root stock in the spring, then die back to the ground in winter (Hosta)
  • Evergreen, or Non-herbaceous Perennials, do not die back in winter (Bergenia)
  • Sub-shrubs retain a woody structure in winter and regrow from that structure in spring (Hardy Fuchsia)

Perennial plants are popular with many gardeners due to their hardy nature, natural beauty, and reliable performance.

Contact NPA:   425-647-6004

Mailing Address:   PO Box 1034  Bellevue, WA  98009-1034

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