Pleurisy Root (Butterfly Weed)

(Asclepias tuberosa)

Pleurisy Root, also known as Butterfly Weed, is a native North American wildflower famous for its brilliant orange blooms and critical role in supporting pollinators—especially monarch butterflies. Unlike other milkweed species, it has little to no milky sap and forms a more compact, upright clump. This hardy perennial thrives in sunny, well-drained locations and is a cornerstone plant for pollinator and native plant gardens.

Plant Specifications

Common Name: Pleurisy Root / Butterfly Weed
Scientific Name: Asclepias tuberosa
Plant Type: Native perennial wildflower
Height: 18–36 inches
Spread: 12–24 inches
Sunlight: Full sun
Soil: Well-drained, sandy or average soil; prefers poorer soils
Water Needs: Low to moderate; drought-tolerant once established
Bloom Time: Late spring through midsummer
Flower Color: Bright orange
USDA Zones: 3–9

Growing Tips

• Plant in full sun—this plant does not tolerate shade well.

• Avoid overly rich soil; it actually performs better in lean, well-drained conditions.

• Once established, it is drought-tolerant and low maintenance.

• Be patient—plants may take a year or two to fully establish but will return stronger each season.

Pollinator Value 🦋

This plant is a powerhouse for pollinators, especially:

• Monarch butterflies (host plant for caterpillars)

• Bees

• Butterflies

• Beneficial insects
  
  

Monarch caterpillars rely on milkweed species like this one as their only food source, making it essential for their life cycle.

Interesting Facts

• The name “pleurisy root” comes from its historical use in herbal medicine, where it was used to treat lung inflammation (pleurisy).

• Unlike many milkweeds, it does not produce milky sap, making it easier to handle.

• Its deep taproot helps it survive drought but makes it difficult to transplant once established.

• It is one of the best native plants for supporting declining monarch butterfly populations.

Garden Learning Connection 🌱

At the Thorn Hill Education Center Garden, Pleurisy Root plays a key role in teaching about native plants, pollinator relationships, and ecological stewardship. Visitors can scan the QR code to learn how planting milkweed supports monarch butterflies and why native species are critical for maintaining healthy ecosystems.