Oxalis oregana, Oregon Oxalis, Wood Sorrel, Pacific Northwest Native Plants, Oregon Native Plant, Sparrowhawk Native Plants, Portland
Oxalis oregana, Oregon Oxalis, Wood Sorrel, Pacific Northwest Native Plants, Oregon Native Plant, Sparrowhawk Native Plants, Portland

Oregon Oxalis

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Oxalis Oregano

  • Size at maturity: 8" tall, 2-3' wide
  • Canopy layer: groundcover
  • Light requirements: part sun/part shade, full shade
  • Moisture requirements: moist soil
  • Growth rate: medium
  • Special features: perennial, semi-evergreen

Oxalis oregana, also known as Redwood sorrel, is a species of the wood sorrel family, Oxalidaceae, native to moist Douglas-fir and Coast Redwood forests of western North America from southwestern British Columbia, Washington, Oregon, and California. This attractive groundcover can spread vigorously when planted in favorable conditions. Oregon oxalis photosynthesizes at relatively low levels of ambient light (1/200th of full sunlight). When direct sunlight strikes the leaves
they fold downwards; when shade returns, the leaves reopen. This process
only takes a few minutes and the movement is observable to the eye. (EMSWCD, 2019)

Photo Credit 1: Tracy Cozine

Photo Credit 2: Tara Lemezis