Western Poison Oak
Rhus diversiloba
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Pl. F5DE — Rhus diversiloba
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IOverview
Overview
Western Poison Oak (Rhus diversiloba) is a vine and shrub native to the Pacific Northwest and California, ranging from British Columbia to Mexico. Known for its light requirement of full sun and preference for moist soil types—light (sandy), medium, or heavy (clay)—it thrives in hardiness zones 4-8. This plant can grow up to 2.5 meters tall and is recognized by its distinctive three-lobed leaves that often turn a vibrant red in autumn. While it poses significant dermatological risks due to urushiol oil, Western Poison Oak has been traditionally used for food, with certain indigenous communities consuming its young shoots and berries.
Quick answers
What is Western Poison Oak?
Western Poison Oak (Rhus diversiloba) is a vine and shrub native to the Pacific Northwest and California, ranging from British Columbia to Mexico. Known for its light requirement of full sun and preference for moist soil types—light (sandy), medium, or heavy (clay)—it thrives in hardiness zones 4-8.
Growingconditions · propagation · uses
VCultivation
Cultivation
Western Poison Oak thrives in full sun and prefers moist soil that is light (sandy), medium, or heavy (clay). It grows well as a vine or shrub to 2.5 meters tall and is hardy in zones 4-8. Propagate this plant via cuttings or seeds. Note its native range includes British Columbia, California, Nevada, Oregon, and parts of Mexico.
Light
Full sun
Water
Moist
Soil
Light (sandy), Medium, Heavy (clay)
Hardiness
4-8
Habit
Vine, Shrub
Mature size
2.5 m tall
For first-time growers
How to grow Western Poison Oak for the first time
8steps
Start with a simple, low-maintenance shrub that can thrive in various conditions.
- 1
What you'll need
Western Poison Oak plant or seeds, potting soil, container, gloves.
- 2
Best time to plant
Plant Western Poison Oak in spring or fall when temperatures are mild.
- 3
Soil and container prep
Use a well-draining mix of light (sandy), medium, or heavy clay soil. Ensure the container has drainage holes.
- 4
Sowing or transplanting
Transplant young plants from nursery pots into your garden or pot. Sow seeds in containers and keep moist until germination.
- 5
First two weeks
Keep the soil consistently moist but not waterlogged. Place in a sunny spot, avoiding direct sunlight during peak heat.
- 6
Ongoing care
Water regularly to maintain moisture levels, especially during dry spells. Prune as needed to control size and shape.
- 7
Harvest or pruning
Prune Western Poison Oak in late winter or early spring before new growth emerges to maintain its shape.
- 8
Common mistakes
Avoid planting near walkways where people might accidentally touch it. Do not plant without wearing protective gloves.
VIEdible & utility
Edible & utility
Edible uses: Oil
Other uses:Weaving materialDyeInkMordantoil
Contextrange · companions · related
VIIDistribution
8 native · 0 introduced
Distribution
8 native · 0 introducedDistribution across0 continents· 8 native
Broader regions
native:British Columbia, California, Mexico Northeast, Mexico Northwest, Mexico Southwest, Nevada, Oregon, Washington
IXSpecimen gallery
1 image
Specimen gallery
1 imageXI
Explore further
Companion planting
Growing zone
XII
About this entry
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Back to the cataloguePlant id · f5ded407-80ff-42e1-b0a6-1809efd69a56
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