Common Name: Green Milkweed

General Information

Asclepias viridiflora is an erect, herbaceous perennial plant producing a cluster of rather stout, usually unbranched (though occasionally branching near the base) stems 15 - 90cm tall[].
The plant can be harvested from the wild for local use as a food and medicine. Like most, if not all Asclepias species, the plants are likely to have also been utilized in various other ways for foods and other materials by the native North American tribes. See Asclepias syriaca for some idea of these potential uses[].

Known Hazards

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. They are only toxic if eaten in large quantities, causing vomiting, stupor, weakness and spasma[, ].
The plants are usually avoided by grazing animals[].

Botanical References

, ,

Range

N. America - Alberta to Ontaria, south to New Mexico, Texas and Florida

Habitat

Sandy, gravelly or calcareous soils in prairies[, ]. Glades, prairies, plains, and rocky or sandy hillsides, spreading to old fields and roadsides[].

Properties

Edibility Rating
Medicinal Rating
Other Uses Rating
Habit	Perennial
Height	0.70 m
Pollinators	Bees, Insects, Lepidoptera
Cultivation Status	Wild

Cultivation Details

Succeeds in any good soil[]. Prefers a well-drained light rich or peaty soil[, ]. Requires a moist peaty soil and a sunny position[, ].
A good bee plant[, ].
The flower of many members of this genus can trap insects between its anther cells - the struggles of the insect in escaping (especially bees and wasps) pulls with it the pollinium (sacs of pollen) which are then transported to the next flower and deposited there, ensuring pollination of the flower[, ].
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[].
Plants resent root disturbance and are best planted into their final positions whilst small[].

Edible Uses

The root can be dried and stored for use as a flavouring in soups[].

The following reports refer to other members of this genus and are possibly also appropriate for this species[].

Unopened flower buds - cooked. They taste somewhat like peas. They are used like broccoli[].
Flowers and young flower buds - cooked. Used as a flavouring and a thickener in soups etc[, ].
The flower clusters can be boiled down to make a sugary syrup[, ]. The flowers are harvested in the early morning with the dew still on them[]. When boiled up it makes a brown sugar[].

Young shoots - cooked. An asparagus substitute[, , , , , , ]. They should be used when less than 20cm tall[]. A slightly bitter taste[].
Tips of older shoots are cooked like spinach[, ].
One recipe suggests you parboil the leaves or young shoots for three minutes, then discard the bitter water and replace with clean boiling water. (Cold water tends to fix the bitterness.) You can repeat this process p to three times to fully leach any bitterness (and many of the nutrients[]), then cook the leaves for 15 minutes before seasoning them. A pinch of soda can be added during cooking to break down the fibe and improve flavour[].

Young seed pods, 3 - 4 cm long, cooked[, , , ]. They are very appetizing. Best used when about 2 - 4cm long and before the seed floss forms, on older pods remove any seed floss before cooking them[, ]. If picked at the right time, the pods resemble okra[].

The sprouted seeds can be eaten[].

An edible oil is obtained from the seed[, ].

The latex in the stems is made into a chewing gum[, ]. It is found mainly in the leaves and is destroyed by frost[]. Yields are higher on dry soils[].

Medicinal

A poultice made from the chewed roots can be applied to rashes, a nursing baby's sore gums and rheumatic joints[]. It can also be used as a poultice on sore eyes[]. The root can also be chewed as a treatment for sore throats whilst an infusion has been used to treat diarrhoea in children[].

An infusion of the whole plant has been used to increase the milk flow of a nursing mother[].

Other Uses

The following reports refer to other members of this genus and are possibly also appropriate for this species[].

A good quality fibre is obtained from the bark, used in making twine, cloth, paper etc[, , ]. It is of poor quality in wet seasons[]. It is easily harvested in late autumn after the plant has died down by simply pulling the fibres off the dried stems[].

The seed floss is used to stuff pillows etc or is mixed with other fibres to make cloth[, , , ]. It is a Kapok substitute, used in Life Jackets or as a stuffing material[]. Very water repellent, it can yield up to 550 kilos per hectare[]. The floss has also been used to mop up oil spills at sea. Candlewicks can be made from the seed floss[, ].

Rubber can be made from latex contained in the leaves and the stems[, , , ]. It is found mainly in the leaves and is destroyed by frost[]. Yields are higher on dry soils[].

Pods contain an oil and a wax which are of potential importance.

The seed contains up to 20% of an edible semi-drying oil[, ]. It is also used in making liquid soap[].

Propagation

Seed - best sown in a greenhouse as soon as it is ripe in the autumn or in late winter[, ]. We have also had good results from sowing the seed in the greenhouse in early spring[], though stored seed might need 2 - 3 weeks cold stratification[]. Germination usually takes place in 1 - 3 months at 18°c[]. 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.