Practical
Plants

Oxalis deppei

Iron Cross Plant

a member of the Oxalis genus in the family Oxalidaceae.

No photo available

Taxonomy and growth

Genus
Oxalis
Height
0.3 m
Spread
0.1 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.

This section contains historical Plants For A Future notes marked noncommercial.

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[5].

Edible uses

This section contains historical Plants For A Future notes marked noncommercial.

Leaves and flowers - raw or cooked[3][7][2]. A delicious lemony flavour, the leaves are tender and fairly free of fibres even when they get older[K]. Both the leaves and the flowers make a very refreshing and thirst-quenching munch in the garden, they also make an excellent flavouring in salads[K]. The leaves are available from June to October and the flowers from July to October, or even later in mild autumns[K]. Use in moderation, see notes at top of sheet. Root - raw or cooked[1][3][6][7][2]. The roots are up to 10cm long and 3cm wide at the top, they are tender and juicy but usually insipid[K]. Occasionally the root has a pleasant acid flavour, we have yet to find out what causes the difference[K].

Plant part
Flowers
Plant part
Leaves
Plant part
Root

Environment

Range
Southern N. America - Mexico. Occasionally established in Europe.
Habitat
Not known
Light
full sun
Shade tolerance
no shade
Water
moderate
Hardiness
Zone 8+
Soil textures
sandy, loamy
Soil pH
acid, neutral
Drainage
well drained
Tolerates Nutritionally Poor Soil
No
Drought
intolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

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. Our plants have never produced seed. Division in autumn, harvest the bulbs and replant in the spring. They usually increase very freely.

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

An easily grown plant, preferring a sandy soil in a warm dry position[1][6][7]. It dislikes dry or heavy soils[7]. Dislikes lime[7]. Prefers a southerly aspect[7]. This species is only hardy outdoors in the milder areas of Britain, tolerating temperatures down to about -5°c or perhaps a bit lower if the soil is very well-drained. The bulbs are easily harvested in late autumn, however, and can be stored overwinter in a cool frost free place, replanting them in the spring[K]. In milder winter areas a good mulch is usually sufficient to see the bulbs through the winter and they will then normally be more productive of leaves and flowers in the following year. Plants have survived the winter for several years without a mulch on our trial grounds in Cornwall[K]. A very ornamental plant, flowering freely all summer[1, K]. It was formerly cultivated in Mexico for its edible tuber[8] (this may be a mistaken entry that should have referred to O. tuberosa. Whilst the root of this plant is edible it is neither productive nor very flavourful. The leaves and the flowers are far superior[K]). This species is closely related to and probably part of O. tetraphylla[4], differing only in its sessile bulbils and truncate leaves[9].

References

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

    ↩1↩2

  2. Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990-00-00 ISBN 0-9628087-0-9

    ↩1↩2

  3. Hedrick. U. P. Sturtevant's Edible Plants of the World. Dover Publications 1972-00-00 ISBN 0-486-20459-6

    ↩1↩2

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

    ↩

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

    ↩

  6. Vilmorin. A. The Vegetable Garden. Ten Speed Press ISBN 0-89815-041-8

    ↩1↩2

  7. Thompson. B. The Gardener's Assistant. Blackie and Son. 1878-00-00

    ↩1↩2↩3↩4↩5↩6

  8. Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959-00-00

    ↩

  9. ? Flora Europaea Cambridge University Press 1964-00-00

    ↩

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