Species · genus Oxalis · Oxalidaceae

Oregon Wood Sorrel

Oxalis oregana Nutt. ex Torr. & A.Gray

Also known as: Oregon Oxalis · Redwood Sorrel · Redwood Woodsorrel

Growth habit

perennial or rhizomatous geophyte

Native range

British Columbia, California, Oregon, Washington

Reference · O. oregana

Cultivars of O. oregana

The named forms growers keep — each with its own page, each honest about how much we know.

No named cultivars catalogued under O. oregana yet. When growers document a stable, named form, it earns its own page here.

Guide

The species-level account. Cultivar pages build on this and say where they differ.

A rhizomatous woodland geophyte of the Pacific Northwest forest floor, this redwood sorrel is adapted to deep shade, cool air, and the steady moisture of a coniferous understory. Give it bright shade to low, indirect light and keep the mix evenly but lightly moist, watering when the top inch has just begun to dry; the storing rhizome will rot if left sitting wet. It prefers cool temperatures and resents direct sun, which scorches its clover-like leaflets.

Care recipe

The species record — the baseline every cultivar inherits unless it says otherwise.

Care notes are early — not yet verified

Light: ai:claude-opus-4-8
Water: ai:claude-opus-4-8 (range 5-10d)
Humidity: ai:claude-opus-4-8
Soil: ai:claude-fable-5
Care: ai:claude-fable-5

Light

Low light

Water

≈ every 10 days

Humidity

High

Temperature

4–24 °C

Soil mix

Humus-rich, moisture-retentive mix that still drains

Propagation

Divide the creeping rhizomes in spring

Fertilizing

Gentle balanced feed monthly in spring and summer

Growth rate

Moderate

Flowering

Delicate white to pale-pink flowers; enjoys cool shade

ToxicityAuthoritative · species

Toxic to cats & dogs & humans

Oxalidaceae are rich in soluble oxalates (oxalic acid salts), which can irritate and, in quantity, cause systemic harm. This is where toxicity lives: every cultivar of this species inherits it and none can override it.

Reference images

Every image credited. Licenses link to their deeds.

No reference gallery yet

A few clear photos — habit, a mature leaf, a flower if it blooms — would give this page its eyes.

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Sources: ai:claude-opus-4-8 · ai:claude-opus-4-8 (range 5-10d) · ai:claude-fable-5 · ai:claude-opus-4-8 (family inference)

Kept true by its growers

Every fact here carries its source. Grow Oregon Wood Sorrel yourself? What you’ve observed — how it drinks, how it holds its color, a name that’s off — is exactly what keeps this page honest. Contributions are reviewed before anything changes.