Willamette Valley Gumweed (Grindelia integrifolia) in bloom. One of 100+ species of Pacific Northwest native plants available at Sparrowhawk Native Plants, Native Plant Nursery in Portland, Oregon.

Willamette Valley Gumweed

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Grindelia integrifolia

Willamette Valley Gumweed (aka Puget Sound Gumplant) is a stout plant, standing up to four feet tall, with extremely showy, yellow flowers that are coveted by native butterflies, bees, syrphid flies, wasps and other beneficial insects. It's one of the few native wildflowers that bloom in late summer, making it an important late-season source of pollen. 

  • Plant type/canopy layer: deciduous, perennial, herbaceous plant
  • Size at maturity: 36”- 48” tall, 12”-18” wide
  • Light requirements: full sun to part shade
  • Moisture requirements: dry to wet soil (lives anywhere!)
  • Growth rate/ease: easy to grow, reseeds easily
  • Bloom time: July to August
  • Wildlife support: The flowers are an important late-season source of pollen and nectar for butterflies, native bees, syrphid flies, wasps and other beneficial insects. 
  • Native habitat/range: Western BC, WA and OR.  Portland Plant List – yes. 
  • Special features & uses: drought tolerant, beneficial insect and pollinator favorite, late summer pollinator plant

Gardening with Willamette Valley Gumweed: Hardy, drought tolerant and easy to grow - this plant is an excellent addition for sunny pollinator meadows. It often acts as a biennial; displaying low clumps of gummy leaves in the first year and tall stems that rise with plentiful late summer blooms in the second. The tall stems often bend and lean over as flowers bloom, which works well when planted among other wildflowers and grasses as its bright yellow blooms seem to float throughout the meadow in late summer.

Seeding Instructions: If direct sowing, do so in fall as this species usually has a fair amount of seed dormancy. Seeds usually need 45-90 days of cold moist chilling at 35-40 degrees before they will germinate in spring. Alternatively, sow seeds in containers and place outdoors in or in a cold frame in February. Seeds should germinate as temperatures rise in late March. Each packet contains approximately 100 seeds.

Photo credit: Steele Acres Native Seed