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Oxalis oregana - Nutt.

Common Name Redwood Sorrel
Family Oxalidaceae
USDA hardiness 6-9
Known Hazards The leaves contain oxalic acid, which gives them their sharp flavour. Perfectly all right in small quantities, the leaves should not be eaten in large amounts since oxalic acid can bind up the body's supply of calcium leading to nutritional deficiency. The quantity of oxalic acid will be reduced if the leaves are cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition[238].
Habitats Redwood forests[187]. Moist woods[60].
Range Western N. America - Washington to California.
Edibility Rating    (3 of 5)
Other Uses    (3 of 5)
Weed Potential No
Medicinal Rating    (1 of 5)
Care (info)
Fully Hardy Moist Soil Full shade Semi-shade Full sun
Oxalis oregana Redwood Sorrel


http://commons.wikimedia.org/wiki/User:Folini
Oxalis oregana Redwood Sorrel
http://commons.wikimedia.org/wiki/User:Folini

 

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Summary


Physical Characteristics

 icon of manicon of flower
Oxalis oregana is an evergreen Perennial growing to 0.2 m (0ft 8in).
See above for USDA hardiness. It is hardy to UK zone 7. It is in leaf all year, in flower from May to July. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It can grow in full shade (deep woodland) semi-shade (light woodland) or no shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map

Synonyms

Habitats

Woodland Garden Dappled Shade; Shady Edge; not Deep Shade; Ground Cover;

Edible Uses

Edible Parts: Flowers  Leaves
Edible Uses:

Leaves - raw or cooked[118, 183, 257]. A acid, flavour, it is especially adored by children and makes an excellent addition to mixed salads[K]. The leaves can be harvested all year round[K]. A mass of the leaves and stems can be allowed to ferment slightly when they make a tasty dessert[183]. A sort of rhubarb pie can be made from the leaf stalks[183]. The leaf stalks are very thin - you would need an awful lot for a pie[K]. Use in moderation, see notes above on toxicity. Flowers - raw[K]. A pleasant acid flavour[K].

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Antirheumatic  Ophthalmic  Poultice

A decoction of the whole plant has been used as a wash in the treatment of rheumatism[257]. The fresh juice of the plant has been used as eye drops to ease sore eyes[257]. A poultice of the wilted leaves has been used as a dressing on boils, sores and on swollen areas of the skin[257].

References   More on Medicinal Uses

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FOOD FOREST PLANTS

Other Uses

A good ground cover plant for a woodland garden[197, 208], though it can be invasive[60]. It needs weeding for the first year or so[197].

Special Uses

Food Forest  Ground cover

References   More on Other Uses

Cultivation details

Easily grown in a moisture-retentive humus-rich soil in shade or dappled sunlight[200]. Succeeds in dense shade[187]. Grows well in a wild or woodland garden[200]. Plants can be very invasive when in suitable conditions[60]. Plant is growing very vigorously in quite dense shade under an Elaeagnus shrub in Cornwall - it stays green all year round and is fairly productive[K]. The plant is heat tolerant in zones 9 through 7. (Plant Hardiness Zones show how well plants withstand cold winter temperatures. Plant Heat Zones show when plants would start suffering from the heat. The Plant Heat Zone map is based on the number of "heat days" experienced in a given area where the temperature climbs to over 86 degrees F (30°C). At this temperature, many plants begin to suffer physiological damage. Heat Zones range from 1 (no heat days) to 12 (210 or more heat days). For example Heat Zone. 11-1 indicates that the plant is heat tolerant in zones 11 through 1.) For polyculture design as well as the above-ground architecture (form - tree, shrub etc. and size shown above) information on the habit and root pattern is also useful and given here if available. The plant growth habit is a clumper with limited spread [1-2]. The root pattern is rhizomatous with underground stems sending roots and shoots along their length [1-2].

References   Carbon Farming Information and Carbon Sequestration Information

Temperature Converter

Type a value in the Celsius field to convert the value to Fahrenheit:

Fahrenheit:

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The PFAF Bookshop

Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees, and Woodland Gardening. Our new book to be released soon is Edible Shrubs.

Shop Now

Propagation

Seed - best sown as soon as ripe in a cold frame. Prick out the seedlings into individual pots when they are large enough to handle and plant them out in late spring or early summer. Division in spring. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.

Other Names

If available other names are mentioned here

Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Oxalis acetosellaWood SorrelPerennial0.1 3-7 FLMHFSNM323
Oxalis adenophyllaSauer KleePerennial0.2 4-8  LMHSNM00 
Oxalis articulataPink SorrelPerennial0.2 7-10  LMNM30 
Oxalis barrelieriBarrelier's woodsorrelPerennial0.0 0-0  LMNDM20 
Oxalis bifida Bulb0.3 8-11  LMNDM20 
Oxalis corniculataYellow Sorrel, Creeping woodsorrelAnnual/Perennial0.1 4-8  LMHNDM221
Oxalis corymbosaLilac Oxalis, Pink woodsorrelPerennial0.2 7-10  LMHNDM20 
Oxalis deppeiIron Cross PlantBulb0.3 7-10  LMNM40 
Oxalis enneaphyllaScurvy GrassPerennial0.1 5-9  LMNDM20 
Oxalis europaea Annual/Perennial0.4 -  LMNDM20 
Oxalis exilisLeast Yellow Sorrel, Shady woodsorrelAnnual/Perennial0.1 4-8  LMHNDM22 
Oxalis frutescensShrubby woodsorrelPerennial0.0 0-0  LMNDM20 
Oxalis grandisGreat Yellow WoodsorrelAnnual/Perennial0.2 5-7 FLMHFSM211
Oxalis lasiandra Perennial0.3 8-11  LMSNM00 
Oxalis magellanica Perennial0.0 5-9  LMSNDM20 
Oxalis montanaMountain Wood SorrelPerennial0.1 0-0  LMHSM201
Oxalis pes-capraeBermuda ButtercupPerennial0.2 8-11  LMNDM20 
Oxalis strictaYellow Wood Sorrel, Common yellow oxalis, Common Yellow Wood Sorrel, OxalisAnnual0.3 0-0 FLMNDM211
Oxalis tetraphylla Perennial0.1 7-10  LMNDM303
Oxalis triangularisOxalisPerennial0.2 10-11 MLMSNDM30 
Oxalis tuberosaOcaPerennial0.5 6-9  LMNM50 
Oxalis violaceaViolet Wood SorrelBulb0.3 4-8  LMHSNDM31 

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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Expert comment

Author

Nutt.

Botanical References

60200

Links / References

For a list of references used on this page please go here

Readers comment

Mona George-Dill   Sun Jan 28 2007

I wish you had a description of the plant. I have in hnd a leaf with stalk, the leaf is plin green at the top, purple at the bottom and the stalk is read. I am not sure what will be the colour of the flowers when the plant does flower, but those that I have so far seen on this island, Dominica, carry a lilac flower. Are we dealing with the same plant?

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