When to Plant Swamp Milkweed Seeds
For outdoor planting, wait until the first fall frost to allow seed stratification for Spring growth. To start indoors, refrigerate seeds for 6-8 weeks before sowing to break dormancy.
Where to Plant Swamp Milkweed Seeds
Asclepias, native to U.S. swamps, thrives in consistently damp or wet, well-draining soil with full sun (6-8 hours daily). It tolerates various soil types but not consistently dry or overly sandy conditions. Plant away from pet frequented areas as the sap is toxic when cut.
How to Plant Swamp Milkweed Seeds
Asclepias seeds can benefit from an optional 8-week treatment called cold moist stratification before planting.
Plant seeds 1/4 inch deep into the soil. When grown indoors, transplant into the garden 18-24 inches apart for best results.
How to Care for Swamp Milkweed Seeds
Asclepias is a low-maintenance plant that can thrive for several years with proper care, regenerating from its strong taproot each Spring. It readily self-seeds in late fall, but this can be managed by removing seed pods in early fall. Asclepias is a favored butterfly attractor, especially for Monarchs, and blooms throughout summer when healthy. Fertilization isn't required. Mulching around each plant reduces weed competition.