Asclepias longifolia

longleaf milkweed
Family

Asclepiadaceae

Leaf Arrangement

opposite

Leaf Type

simple

Leaf Shape

linear

Growth Form

forb

Flower Color

green, purple, white

Flower Month

April - July

Height (meters)

0.2 - 0.7

Milky Sap

Yes

Armed/Unarmed

Unarmed

Origin

native

Lifespan

perennial

Growing Season

Warm season


Wetland Class

FACW

Wetland Coefficient of Conservatism

7

Prairie Coefficient of Conservatism

7

Field Characters

Milky sap, no hairs. Usually found in piney woods. White flowers with purple cast. Narrow, opposite leaves and hoods that are bent abruptly away from the anther.

Cultural Information

Prefers full sun although it will tolerate some shade. It is easily propagated by seed and the seed requires no treatment. The pods split 4-6 weeks after flowering and the seeds should be kept in the pod until ripe. Fresh seed may be sown immediately in pots or where it is to grow in the ground. The germination of stored seed improves with cold/moist stratification (Steffen 1997). Seeds average approximately 50,000 seed/lb and the recommended planting rate is 25 lbs/acre. Blooms in 1-2 years from seed. Stem cuttings can be taken during the growing season, dipped in rooting harmone, and rooted in sand or potting soil.

Animal Use

Larval host plant of monarch butterflies.

Natural History

All milkweeds are called "herb 'a houatte" by Acadians and is thought to be a variation of "ouate" or "cotton wool". This name may refer to the use of its seed silk as down (Holmes 1990).

Habitat

Pine savannas, bogs, sandstone glades, and coastal prairies.