Practical
Plants

Asclepias sullivantii

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Taxonomy and growth

Life cycle
perennial
Height
1.2 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.

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].

Material uses

Rubber can be made from latex contained in the leaves and the stems[3]. The plant is a potential commercial source of rubber[2]. It contains up to 8% latex[3].

Product or use
Latex

Environment

Range
N. America - Ontario to Ohio, Minnesota, Nebraska, Missouri and Kansas.
Habitat
Moist lowland areas[3], in rich ground and on prairies[10].
Light
full sun
Shade tolerance
light shade
Water
moderate
Soil textures
sandy
Soil pH
acid, neutral, alkaline
Drainage
well drained
Tolerates Nutritionally Poor Soil
No
Drought
intolerant

Propagation

Seed - best sown in a greenhouse as soon as it is ripe in the autumn or in late winter[4][5]. 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[4]. Germination usually takes place in 1 - 3 months at 18°c[4]. 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

Prefers a well-drained light rich or peaty soil in a sunny position[1][6]. 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[4]. 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. Polhamus. L. G. Rubber: Botany, Cultivation and Utilization.

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

    ↩1↩2↩3

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

    ↩1↩2↩3↩4

  5. Buchanan. R. A Weavers Garden.

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

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  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. Britton. N. L. Brown. A. An Illustrated Flora of the Northern United States and Canada Dover Publications. New York. 1970-00-00 ISBN 0-486-22642-5

  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. Fernald. M. L. Gray's Manual of Botany. American Book Co. 1950-00-00

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