Whorled Milkweed (Asclepias verticillata)

Whorled Milkweed

Asclepias verticillata

Asclepias verticillata, known as Whorled Milkweed, is a slender perennial that typically grows 1 to 2 feet tall. It has narrow, whorled leaves and produces clusters of small, white flowers from July to September. This species is commonly found in prairies, open woods, and along roadsides, preferring dry, sandy, or rocky soils. Whorled Milkweed is a host plant for monarch butterflies and attracts various pollinators. In landscaping, it is valued for its delicate foliage and late-season blooms, making it suitable for naturalized areas and wildflower gardens.

Characteristics

Product Form	Plant, Seed
Type	Forb
Sun	Full Sun, Partial Sun
Soil	Loam, Sand/Gravel, Calcareous
Moisture	Dry, Mesic
Average Max Height (inches)	28
Suggested Plant Spacing (inches)	15
Bloom month(s)	July, August, September
Bloom Color or Type	White
Dominance	Medium

Range Maps

Sowing Information

Sow seed onto a firm, weed-free seedbed. Hand-broadcast seed making two perpendicular passes for even coverage. If planting a mix, broadcast the grass component first and lightly rake/drag it into the top 1/8–1/4" of soil. Next, broadcast wildflower/forb seed and press it into the soil surface (with a roller/cultipacker or the back of a rake) to ensure good seed-to-soil contact. After seeding, apply a very light layer of clean, seed-free straw (or other weed-free, site-appropriate mulch) to reduce erosion and retain moisture without smothering seedlings. A good rainfall or thorough watering will help settle seed and mulch and improve germination.

Planting Information

Dig a hole in your planting site slightly larger than the plant’s root system. When placing the plant into the hole, ensure that the soil line remains consistent with its original level in the pot. Fill in around the roots with the excavated soil, gently firming it to eliminate air pockets. Water the plant thoroughly the same day to promote successful establishment.