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Purge the Spurge

We're on a mission to eradicate Oblong Spurge in Benton County, and we need your help!

Our undertaking began as a response to four sightings of oblong spurge (Euphorbia oblongata) in Benton County in 2019. Oblong spurge is a high priority A-List noxious weed as designated by the Oregon Department of Agriculture. This designation means current infestation levels of oblong spurge in Benton County are at a low enough scale for feasible containment. These sites are treated with herbicide or mechanical removal. This project is made possible thanks to funding received from the Oregon State Weed Board and assistance from the Oregon Department of Agriculture Invasive Weed Program. 

Actions and accomplishments:

  • More than 100 sites in the Corvallis, Philomath, and Lewisburg areas are currently being monitored for oblong spurge.
  • 30+ new sites discovered since 2023
  • Almost 24 acres at 30 different sites were surveyed at confirmed landowner sites for oblong spurge. About 10 acres of this surveyed area received treatment for oblong spurge. The largest site is about 2.5 acres worth of treatment.
  • Hundreds of postcards and door hangers distributed across the county to alert people of this threat

We have funding to help you remove this weed, free of charge!

do you suspect you may have oblong spurge? take some pictures and send them to cierra@bentonswcd.org
Green plants and shrubs with different textures and leaf shapes growing in a garden.
Oblong spurge foliage
Yellow wildflowers growing between a concrete surface and a plant with green leaves.
Oblong spurge flowers
Bright yellow-green flowers with star-shaped petals and lush green leaves in a dense cluster.
Closeup of flowers and bracts
May contain: leaf, plant, flower, petal, vegetation, anther, and green
Closeup
May contain: garden, nature, outdoors, backyard, yard, fence, hedge, plant, vegetation, grass, tree, and landscape
A clump of oblong spurge along a street in Corvallis
Yellow flowers with oblong leaves and upright stems. Text: "Wanted: Oblong Spurge. Lookout for this weedy invader!"
ID tips
Green plants and shrubs with different textures and leaf shapes growing in a garden.
Yellow wildflowers growing between a concrete surface and a plant with green leaves.
Bright yellow-green flowers with star-shaped petals and lush green leaves in a dense cluster.
May contain: leaf, plant, flower, petal, vegetation, anther, and green
May contain: garden, nature, outdoors, backyard, yard, fence, hedge, plant, vegetation, grass, tree, and landscape
Yellow flowers with oblong leaves and upright stems. Text: "Wanted: Oblong Spurge. Lookout for this weedy invader!"
Poster about oblong spurge (Euphorbia oblongata), a noxious weed needing management, with contact info and images.