Swamp milkweed is one of the common names for Asclepias incarnata. It is also known as rose milkweed, swamp silkweed, rose milkflower, and white Indian hemp.
The stratification process involves a cool dry chill, or a cool moist chill, for approximately thirty days in the fridge. Place in vermiculite in a baggie for the moist chill period.
Plant the swamp milkweed seedlings into a prepared garden bed, approximately one and one half to two feet apart, to allow for growth of the plants at maturity.
Swamp milkweed grows best in full sun, however will also grow in a partial shade location as long as there are at least six to eight hours of direct sunlight per day.
As the name suggests, swamp milkweed will grow in a swampy and high moisture location, and prefers a moist soil, although it will also grow in regular garden soil.
Pruning or deadheading the swamp milkweed seed pods will help to prevent reseeding. You can also prune back the old milkweed stems, as part of winter or spring garden cleanup.
Swamp milkweed is a very important plant for the survival of the monarch butterfly, and planting even a small patch can make a difference for this species.