Soil & potting mix
Best soil for Redwood Sorrel (Oxalis oregana)
Also called Redwood Sorrel, Oregon Oxalis.
More about redwood sorrel
About Redwood Sorrel
Oxalis oregana · also called Redwood Sorrel, Oregon Oxalis · edible
A vigorous Pacific coast ground-cover perennial carpeting the floor of redwood and mixed conifer forests with large, clover-like trifoliate leaves and white or pink flowers spring through autumn. Leaves are edible in small amounts with a lemony tang. An outstanding shade ground cover for moist western gardens; spreads freely by rhizome.
Preferred mix: Humus-rich, moist, well-draining loam; tolerates sandy and clay
Watch for — Vigorous spreading: Oxalis oregana spreads aggressively by rhizome and can overwhelm smaller plants in a border. Install root barriers or confine to areas where ground-covering spread is desired.
Why redwood sorrel needs this mix
Redwood Sorrel is a hungry, thirsty crop — it wants a rich, moisture-retentive but free-draining loam, well fed and never baked dry.
- Redwood Sorrel grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
- Plenty of organic matter holds moisture evenly, which prevents the stress problems (bolting, bitterness, blossom-end rot) that come from a drying-then-flooding cycle.
- It still needs structure: rich does not mean airless, so grit, perlite or leaf mould keeps roots oxygenated.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons redwood sorrel struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A poor, thin or sandy mix starves redwood sorrel — growth stalls, leaves pale, and yields collapse.
- A heavy, compacted, badly drained soil rots the roots and brings fungal problems despite all the feeding.
- Letting a rich mix dry to dust then drowning it causes the classic moisture-stress disorders this crop is prone to.
Under-feeding and inconsistent moisture. Redwood Sorrel needs genuinely rich soil plus steady watering — most disappointing crops come down to one or both being short.
pH — does it matter for redwood sorrel?
Redwood Sorrel does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
For containers a good multipurpose or vegetable compost works for redwood sorrel with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Drainage and the pot
Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Redwood Sorrel is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. When the time comes, our repotting guide for redwood sorrel covers the timing and technique step by step.
Redwood Sorrel soil — frequently asked questions
What is the best soil mix for redwood sorrel?
3 parts compost-amended loam or quality multipurpose compost : 1 part well-rotted garden compost or manure : 1 part perlite or grit (containers) / leaf mould (beds). Redwood Sorrel grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
Can I use normal potting soil for redwood sorrel?
A poor, thin or sandy mix starves redwood sorrel — growth stalls, leaves pale, and yields collapse. For containers a good multipurpose or vegetable compost works for redwood sorrel with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Does redwood sorrel need a special pH?
Redwood Sorrel does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
Should I buy a bagged mix or make my own for redwood sorrel?
For containers a good multipurpose or vegetable compost works for redwood sorrel with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
How often should I refresh the soil for redwood sorrel?
Redwood Sorrel is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Keep reading
- Redwood Sorrel care — the full brief (light, water, humidity, problems, pet safety)
- How often to water redwood sorrel — the schedule the mix feeds into
- Repotting redwood sorrel — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Why is my plant wilting? Wet vs dry diagnosis
- Underwatered plant — signs and how to rehydrate it
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- All 8452 soil and potting-mix guides in the Growli library