Practical
Plants

Asclepias subulata

Rush Milkweed

a perennial member of the Asclepias genus in the family Asclepiadaceae.

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Taxonomy and growth

Life cycle
perennial
Height
2 m
Fertility
Bees, Insects, Lepidoptera
Flower type
hermaphrodite
Pollinators
Bees, Insects, Lepidoptera

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.

Although no specific reports have been seen for this species, many, if not all, members of this genus contain toxic resinoids, alkaloids and cardiac glycosides[9]. They are usually avoided by grazing animals[9]. One report says that the plant is considered poisonous by some native North American Indian tribes[8].

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 plant is emetic, ophthalmic, purgative and stomachic[10][8]. The reports do not specify which part of the plant is used.

Product or use
Emetic
Product or use
Ophthalmic
Product or use
Purgative
Product or use
Stomachic

Material uses

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

Rubber can be made from latex contained in the leaves and the stems[10][2][5].

Product or use
Latex

Environment

Range
South-western N. America.
Habitat
Desert washes and sandy places below 600 metres in California[11].
Light
full sun
Shade tolerance
light shade
Water
moderate
Hardiness
Zone 6+
Soil textures
sandy
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 greenhouse as soon as it is ripe in the autumn or in late winter[3][4]. We have also had good results from sowing the seed in the greenhouse in early spring[K], though stored seed might need 2 - 3 weeks cold stratification[3]. Germination usually takes place in 1 - 3 months at 18°c[3]. As soon as the seedlings are large enough to handle, prick them out into individual pots and grow them on in the greenhouse for their first winter. Plant out when they are in active growth in late spring or early summer and give them some protection from slugs until they are growing away strongly. Division in spring. With great care since the plant resents root disturbance. Pot the divisions up and place them in a lightly shaded position in the greenhouse until they are growing away strongly, then plant them out in the summer, giving them some protection from slugs until they are established.. Basal cuttings in late spring. Use shoots about 10cm long with as much of their white underground stem as possible. Pot them up individually and place them in a lightly shaded position in a greenhouse until they are rooting and growing actively. If the plants grow sufficiently, they can be put into their permanent positions in the summer, otherwise keep them in the greenhouse until the following spring and when they are in active growth plant them out into their permanent positions. Give them some protection from slugs until they are established.

Cultivation

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

Prefers a well-drained light rich or peaty soil in a sunny position[1][6]. Succeeds in poor soils. Many members of this genus seem to be particularly prone to damage by slugs. The young growth in spring is especially vulnerable, but older growth is also attacked and even well-established plants have been destroyed in wet years[K]. Plants resent root disturbance and are best planted into their final positions whilst small[3]. A xerophytic plant, it looks like a species of Ephedra[6]. The flower of many members of this genus can trap insects between its anther cells, the struggles of the insect in escaping ensure the pollination of the plant[7].

References

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

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  2. Whiting. A. G. A Summary of the Literature on Milkweeds (Asclepias spp) and their utilization.

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  3. Rice. G. (Editor) Growing from Seed. Volume 2. Thompson and Morgan. 1988-00-00

    ↩1↩2↩3↩4

  4. Buchanan. R. A Weavers Garden.

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  5. Hill. A. F. Economic Botany. The Maple Press 1952-00-00

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

    ↩1↩2

  7. Coffey. T. The History and Folklore of North American Wild Flowers. Facts on File. 1993-00-00 ISBN 0-8160-2624-6

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  8. Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998-00-00 ISBN 0-88192-453-9

    ↩1↩2

  9. Diggs, Jnr. G.M.; Lipscomb. B. L. & O'Kennon. R. J Illustrated Flora of North Central Texas Botanical Research Institute, Texas. 1999-00-00 http://artemis.austincollege.edu/acad/bio/gdiggs/NCTXpdf.htm

    ↩1↩2

  10. Usher. G. A Dictionary of Plants Used by Man. Constable 1974-00-00 ISBN 0094579202

    ↩1↩2

  11. Munz. A California Flora. University of California Press 1959-00-00

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