How to Grow Asclepias

9 Sep
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Butterfly Weed is a beautiful perennial plant that is also known as Orange Milkweed. Follow along with this handy How to Grow Asclepias guide and enjoy butterflies, hummingbirds, and a host of other pollinators in your garden. When transplanted seedlings are 10-15cm (4-6″) tall, pinch back the growing tip to encourage multiple flowering points. Asclepias tuberosa prefers dry, sandy conditions or any average garden soil in full sun. Plants grown from seed bloom in the first year if given an early start.  They can be pulled up in fall and treated like annuals to prevent spreading. Asclepias does not divide well, but it’s an outstanding choice for xeriscaping.

Ascelpias tuberosa
Family: Apocynaceae

Note: Do not confuse this species with Asclepias speciosawhich is the primary food plant of the monarch butterfly caterpillar.


Season & Zone
Exposure: Full sun
Zone: 3-10

Sow indoors late February to the end of March and transplant or direct sow towards late April. Optimal soil temperature for germination: 10-25°C (50-75°F). Seeds should sprout in 7-35 days. Asclepias may benefit from stratification: Seeded trays are wrapped in plastic and refrigerated for two to three weeks before being placed over bottom heat. This may result in more even and speedier germination.

Barely cover the small seeds using sterilized seed starting mix. Space transplants 30-60cm (12-24″) apart.

Note: All parts of the plant are harmful if eaten. Flowers are not edible.

Download our Asclepias tuberosa Factsheet.