Common Milkweed (Asclepias syriaca)

Common Milkweed

Asclepias syriaca

Asclepias syriaca, or Common Milkweed, is a perennial plant that typically grows 2 to 5 feet tall. It features broad, oval-shaped leaves and produces large, spherical clusters of fragrant pink to purplish flowers from June to August. Common Milkweed is commonly found in fields, along shores, and edges of woods, thriving in a variety of soil types, including sandy, loamy, and clay soils. It serves as a crucial host plant for monarch butterflies, providing food for caterpillars. However, it can be aggressive in growth, spreading through rhizomes and seeds, and may crowd out other plants if not managed properly. In landscaping, it is appreciated for its ecological benefits and fragrant blooms but should be planted with consideration to its spreading nature.

Characteristics

Product Form	Plant, Seed
Type	Forb
Sun	Full Sun, Partial Sun
Soil	Clay, Loam, Sand/Gravel, Calcareous
Moisture	Dry, Mesic, Wet
Average Max Height (inches)	42
Suggested Plant Spacing (inches)	15
Bloom month(s)	June, July, August
Bloom Color or Type	Pink
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.