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

Regular price
Sold out
Sale price
$5.95
Unit price
per 

Aka Puget Sound Gumweed

Grindelia integrifolia

This stout plant often acts as a biennial: mostly vegetative the first year, with a few flowers, then displays an impressive amount of blooms in the second year.  The flowers are an important late-season source of pollen and nectar for butterflies, native bees, syrphid flies, wasps and other beneficial insects. 

  • 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 (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 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 Puget Sound Gumweed: Hardy, drought tolerant and easy to grow - an excellent addition for sunny wildflower meadows.  The first year gardeners will see low clumps of dense bright leaves with a somewhat “gummy” feel.  By the second year, tall stems will rise with plentiful late summer blooms coveted by pollinators.  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.

Seed Packet Contains: approximately 100 seeds

Seeding Instructions

Direct sowing: fall sowing is recommended as this species usually has a fair amount of seed dormancy. Seeds usually need 45-90 days of cold moist chilling (35-40 degrees) before seeds will germinate in spring.

Growing transplants: sow seeds in containers and place outdoors in or in a cold frame in February, seeds should germinate as temperatures rise in late March.

Photo credit: Steele Acres Native Seed