Asclepias incarnata (Swamp Milkweed) [20 Seeds]


Germination Information: I recommend these seeds for experienced seed-starters only, because they may require some patience. The easiest approach is to sow the seeds—barely covered with growing medium—in fall to late winter, setting them outdoors in a spot protected from mice so they can get a chilling period and then germinate when conditions are right in spring. (The winter-sowing approach can work well with these seeds.)

If you sow after February, give the pot an artificial chilling period of about a month.

It is possible that these seeds could germinate if you sow them in warm, moist, bright conditions, though you may get fewer seedlings that way. If you try that and no seedlings appear within 3 weeks or so, then try the artificial chilling period as mentioned above before moving them back to warmth and light.

Note that this information will not appear on the seed packet you receive.

Please read the description as well before ordering.

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Swamp milkweed (Asclepias incarnata) produces clusters of fragrant, pink flowers in mid to late summer atop 3- to 5-foot-tall stems. This US native naturally grows in moist to wet soil but can adapt to average garden conditions. Like common milkweed (A. syriaca), swamp milkweed serves as a food source for monarch butterfly larvae, which feed on the leaves. The flowers also attract a variety of adult butterflies, as well as other pollinators. Unlike common milkweed, swamp milkweed tends to stay in distinct clumps, so it can be a good option for smaller gardens. These seeds are from plants growing wild in my meadow in Bucks County, PA. Full sun. Perennial; Zones 3 to 8 or 9.

Collected in late September and early October 2023. At least 20 seeds. PA ecotype. Shipping to US addresses only.

Please read the germination information as well before ordering.

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