Practical
Plants

Rhus sempervirens

a perennial woody evergreen member of the Rhus genus in the family Anacardiaceae.

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Taxonomy and growth

Genus
Rhus
Life cycle
perennial
Foliage
evergreen
Woodiness
woody
Height
3.5 m
Fertility
Self sterile, Bees
Flower type
dioecious
Pollinators
Bees

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.

There are some suggestions that the sap of this species can cause a skin rash in susceptible people, but this has not been substantiated. See also notes in 'Cultivation Details'.

Edible uses

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

Fruit - raw or cooked[3]. The fruit is small with very little flesh, but it is produced in fairly large panicles and so is easily harvested. When soaked for 10 - 30 minutes in hot or cold water it makes a very refreshing lemonade-like drink (without any fizz of course)[3]. The mixture should not be boiled since this will release tannic acids and make the drink astringent.

Product or use
Drink
Plant part
Fruit

Medicinal uses

Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.

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

The leaves are used in domestic medicine for relieving asthma[7]. Some caution is advised in the use of the leaves and stems of this plant, see the notes above on toxicity.

Product or use
Antiasthmatic

Material uses

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

An oil is extracted from the seeds[8]. It attains a tallow-like consistency on standing and is used to make candles. These burn brilliantly, though they emit a pungent smoke[8]. The leaves are rich in tannin. They can be collected as they fall in the autumn and used as a brown dye or as a mordant[4].

Product or use
Dye
Product or use
Mordant
Product or use
Oil

Environment

Range
Southern N. America - Texas, New Mexico and Mexico.
Habitat
Dry slopes[5], rocky hillsides and cliffs, 600 - 2250 metres[3].
Light
full sun
Shade tolerance
no shade
Water
moderate
Soil textures
sandy, loamy, clay
Soil pH
acid, neutral, alkaline
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 in a cold frame as soon as it is ripe. Pre-soak the seed for 24 hours in hot water (starting at a temperature of 80 - 90c and allowing it to cool) prior to sowing in order to leach out any germination inhibitors[6]. This soak water can be drunk and has a delicious lemon-flavour. The stored seed also needs hot water treatment and can be sown in early spring in a cold frame[6]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Cuttings of half-ripe wood, 10cm with a heel, July/August in a frame[6]. Root cuttings 4cm long taken in December and potted up vertically in a greenhouse. Good percentage[9][6]. Suckers in late autumn to winter[6].

Cultivation

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

We have very little information on the hardiness of this species and do not know if it will succeed outdoors in Britain. It is unlikely to succeed anywhere outside the mildest areas of the country. The following notes are based on the general needs of the genus. Succeeds in a well-drained fertile soil in full sun[2][6]. The young growth in spring can be damaged by late frosts. Plants have brittle branches and these can be broken off in strong winds[6]. Plants are also susceptible to coral spot fungus[2]. Plants in this genus are notably resistant to honey fungus[6]. Many of the species in this genus are highly toxic and can also cause severe irritation to the skin of some people, whilst other species such as this one are not poisonous. It is relatively simple to distinguish which is which, the poisonous species have axillary panicles and smooth fruits whilst non-poisonous species have compound terminal panicles and fruits covered with acid crimson hairs[1][8]. The toxic species are sometimes separated into their own genus, Toxicodendron, by some botanists[6]. Dioecious. Male and female plants must be grown if seed is required.

References

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

    ↩

  2. Bean. W. Trees and Shrubs Hardy in Great Britain. Vol 1 - 4 and Supplement. Murray 1981-00-00

    ↩1↩2

  3. Vines. R. A. Trees of Central Texas. University of Texas Press 1987-00-00 ISBN 0-292-78958-3

    ↩1↩2↩3

  4. Buchanan. R. A Weavers Garden.

    ↩

  5. Pesman. M. W. Meet Flora Mexicana. Dale S. King. Arizona. 1962-00-00

    ↩

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

    ↩1↩2↩3↩4↩5↩6↩7↩8↩9

  7. Vines. R.A. Trees of North Texas University of Texas Press. 1982-00-00 ISBN 0292780206

    ↩

  8. Grieve. A Modern Herbal. Penguin 1984-00-00 ISBN 0-14-046-440-9

    ↩1↩2↩3

  9. Sheat. W. G. Propagation of Trees, Shrubs and Conifers. MacMillan and Co 1948-00-00

    ↩

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