Native / Warm season
Swamp Milkweed
Moist pollinator beds and monarch-support plantings.
Grown for habitat, not food use.
Seed spacing and maturity
- Days to maturity
- 365
- Germination temperature
- 55-75F
- Seed depth
- 0.25 inches
- Spacing
- 24 inches
- Row spacing
- 30 inches
- Start method
- Direct sow
Frost-date timing
- Direct sow
- 14 days before last frost
- Fall planting
- 10 weeks before first frost
Action plan
- Can I plant this now?
- Use your local last-frost, first-frost, and soil-temperature checks before treating this crop as plantable today.
- Start indoors or direct sow?
- Direct sow into the final bed when the soil temperature, seed depth, and moisture are ready.
- How much space?
- 24 inches in-row spacing, 30 inches between rows, and 0.25 inch seed depth.
- Best companions?
- Use this as part of a diverse flowering or herb planting, and treat companion claims as site-specific rather than guaranteed pest control.
- Common failure modes?
- Dry sandy beds are a poor fit unless irrigated. Moderate to high moisture; tolerates damp sites. Moist soil, rain gardens, and pond-edge plantings.
Growing profile
- Sun
- Full sun to part shade
- Water
- Moderate to high moisture; tolerates damp sites.
- Soil
- Moist soil, rain gardens, and pond-edge plantings.
- Watch
- Dry sandy beds are a poor fit unless irrigated.
- native
- monarch-host
- rain-garden
- pollinators
Browse context
- Native Catalog Category collection
- Milkweed Family Rotation and family context
- Warm Season Seeds Season collection
- Direct Sow Seeds Start-method collection
- High Pollinator Value Seeds Practical trait collection
- Fall-Planting Seeds Practical trait collection
- Part-Shade-Tolerant Seeds Practical trait collection
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