Butterfly milkweed
Butterfly milkweed (Asclepias tuberosa) is the drought-tolerant, upland milkweed species in the monarch conservation toolkit. Its brilliant orange flat-topped flowers bloom June through August, and it is the most reliable non-invasive milkweed for CP42 pollinator plantings on dry-mesic and mesic sites.
Why landowners plant butterfly milkweed
- Monarch host plant — larvae feed exclusively on Asclepias species.
- Non-aggressive growth habit — will not spread rhizomatically like common milkweed.
- Deep taproot makes mature plants drought-proof.
- Blooms during peak monarch migration and breeding.
Site fit
Butterfly milkweed fits dry to mesic upland sites and is the standard milkweed for CP42 dry pollinator mixes. On wet-mesic to hydric sites, swap it for swamp milkweed (Asclepias incarnata). Both are host plants for monarchs.
Establishment
Seed benefits strongly from cold stratification — dormant seeding November through February is best. Plant 1/8 inch deep or surface-broadcast with cultipacking. Expect a rosette-only first year, first bloom in year two, and full flowering in year three.
Management
Tolerates prescribed burn on a 3–5 year rotation. Avoid burning during bloom or seed-set.
CRP practice fit
Required component of most state monarch-focused CP42 pollinator mixes.
Included at 0.05–0.1 lb/ac in high-diversity CP25 mixes.
Standard forb in prairie strip conservation plantings.
Featured mixes with butterfly milkweed
Pairs well with
Purple coneflower · Little bluestem · Prairie blazing star · Black-eyed Susan
Frequently asked questions
No. Butterfly milkweed (Asclepias tuberosa) is a well-behaved, drought-tolerant upland species with orange flowers. Common milkweed (Asclepias syriaca) spreads by rhizomes and is much more aggressive — most quality CP42 mixes prefer butterfly milkweed or swamp milkweed instead.
Ideally yes. Butterfly milkweed covers dry-mesic sites; swamp milkweed covers wet-mesic; common or showy milkweed can be included on aggressive-tolerant sites. Multiple species extend the bloom window and provide larval food across moisture zones.