Practical
Plants

Oxalis corymbosa

Lilac Oxalis

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Taxonomy and growth

Genus
Oxalis
Life cycle
perennial
Height
0.15 m
Fertility
Insects
Flower type
hermaphrodite
Pollinators
Insects

Uses

Toxicity

Toxicity warning. The historical record reports a hazard for this plant. Do not use it to decide which parts are safe to eat or use medicinally.

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[6].

Edible uses

Leaves and leafstalks - raw or cooked[2]. Use in moderation, see notes at top of sheet. Flowers - raw. A pleasant acid flavour, they make an ornamental addition to a mixed salad[K]. Root - raw. Sweet, crisp and succulent[2][4].

Plant part
Flowers
Plant part
Leaves
Plant part
Root

Environment

Range
S. America. Naturalized in Britain.
Habitat
A weed of disturbed ground and gardens in Britain, especially near London[3].
Light
full sun
Shade tolerance
no shade
Water
moderate
Hardiness
Zone 8+
Soil textures
sandy, loamy, clay
Soil pH
acid, neutral, alkaline
Drainage
well drained
Tolerates Nutritionally Poor Soil
No
Drought
intolerant

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.

Cultivation

Easily grown in a sandy soil in a warm dry position[1]. Plants are not very hardy in Britain according to one report which lists this plant as succeeding in climatic zone 9 and thus only tolerating occasional light frosts[5]. However, it is naturalized in parts of Britain, especially near London[3]. It is growing well in our Cornwall site, where it has proved to be hardy since 1994[K].

References

  1. F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951-00-00

    ↩

  2. Cribb. A. B. and J. W. Wild Food in Australia. Fontana 1976-00-00 ISBN 0-00-634436-4

    ↩1↩2

  3. Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962-00-00

    ↩1↩2

  4. Kunkel. G. Plants for Human Consumption. Koeltz Scientific Books 1984-00-00 ISBN 3874292169

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  5. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩

  6. Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995-00-00 ISBN 0-7513-020-31

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