Butterfly milkweed is a Missouri native perennial that brings vibrant orange to yellow-orange flower clusters to gardens from June through August, growing 12 to 30 inches tall and thriving in zones 3 to 9. This drought-tolerant, deer-resistant plant blooms reliably in full sun with moderate water, and unlike many milkweeds, it has no milky sap in its stems. Seeds germinate in 60 to 75 days at temperatures between 60 and 75 degrees Fahrenheit, making it straightforward to start from seed, though plants may take 2 to 3 years to flower once established. Once mature, it becomes a long-lived perennial that attracts butterflies and other pollinators while requiring minimal maintenance.
Full Sun
Moderate
3-9
30in H x 18in W
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Low
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Butterfly milkweed displays showy clusters of bright orange flowers that emerge reliably every summer, drawing monarchs and countless other butterfly species into the garden. Its deep taproot and tuberous origin make it exceptionally drought tolerant and able to thrive in poor, rocky, or shallow soils where many plants struggle. The plant's frost hardiness down to zone 3 and deer resistance mean it persists through harsh conditions without fuss, while its low maintenance needs and modest size allow it to slip into containers, rain gardens, or naturalized spaces with equal grace.
Butterfly milkweed is grown primarily to attract and support butterflies, particularly monarch butterflies, and to provide nectar and pollen for a broad range of pollinators including hummingbirds and bees. Its fresh-cut flowers also serve as striking additions to bouquets. In landscape design, it excels in naturalized plantings, rain gardens, and as a colorful accent in containers or perennial borders.
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Start seeds indoors 6 to 8 weeks before the last spring frost at temperatures between 60 and 75 degrees Fahrenheit. Seeds germinate readily at these temperatures and will be ready to transplant outdoors after the frost date has passed and soil has warmed.
Transplant seedlings outdoors after the last spring frost once soil has warmed and plants have been hardened off over 7 to 10 days. Space plants 12 to 18 inches apart. Handle with care and disturb the roots as little as possible, as the deep taproot makes butterfly milkweed reluctant to transplant; it is often best grown in place from seed rather than moved once established.
Direct sow seeds in fall or early spring in prepared beds of well-drained soil in full sun. Scatter seeds on the soil surface or press them lightly into the soil, as they benefit from light exposure for germination.
For fresh-cut flowers, harvest in the morning when the flowers are at their freshest and petals are just opening. Cut with a clean knife that has been dipped in a 10 percent household bleach solution to prevent disease transmission. Place cut stems immediately in a vase with a few drops of bleach added to the water to prolong their beauty.
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“Asclepias tuberosa subsp. interior is a native perennial of Missouri and the greater Midwest, documented as occurring naturally in dry, rocky open woods, glades, prairies, fields, and roadsides throughout the region. This species has been valued for generations not for cultivation alone but as a host plant for monarch butterfly larvae, becoming increasingly important as gardeners and conservationists work to rebuild monarch habitat across North America.”