Milkweed Red

Asclepias curassavica
Categories:
Perennials  ·  
Perennials
Light
Full sun (afternoon shade in low desert)
Water
Moderate water; irrigate deeply and allow the upper few inches of soil to dry between waterings. Young plants need more consistent moisture. Established plants tolerate some drought, but Phoenix summers generally require supplemental irrigation.
Size
2-3 ft tall × 1-2 ft wide
Habit
Perennial clump
Toxicity
Toxic — Pets Humans & Livestock
Description
Common milkweed is a rhizomatous perennial with broad leaves and fragrant flower clusters. ‘Red’ is not a well-established cultivar of Asclepias syriaca; verify the plant’s identity, since red milkweed commonly refers to other species. Details below apply to A. syriaca, which is poorly suited to Phoenix’s extreme summer heat.
Bloom Time
Spring through fall
Deciduous / Evergreen
Semi-evergreen
Special Features
Attracts Bees / Pollinators, Attracts Butterflies, Fragrant
Growth Rate
Fast
Growth Habit
Perennial clump
Mature Size
2-3 ft tall × 1-2 ft wide
Flower Color
Red and orange
Foliage Color
Green
Landscape Use
Border / Bed, Desert / Xeriscape, Pollinator / Wildlife Garden
Garden Style
Desert / Xeriscape, Pollinator / Wildlife
Soil
Alkaline Tolerant, Sandy / Rocky, Well-Drained
Companion Plants
Autumn sage, Blanket flower, Desert marigold
Toxic — Pets Humans & Livestock
Toxic to pets, livestock, and humans if ingested (cardiac glycosides); milky sap is a skin/eye irritant
Care Instructions

Light: Full sun in cooler climates; in Phoenix, provide morning sun and afternoon shade, avoiding reflected heat.

Water: Moderate water; irrigate deeply and allow the upper few inches of soil to dry between waterings. Young plants need more consistent moisture. Established plants tolerate some drought, but Phoenix summers generally require supplemental irrigation.

Soil: Well-drained sandy loam to clay loam. Tolerates varied soils, including moderately alkaline soil; avoid persistently saturated conditions.

Mature size: 3–5 feet tall and about 1–3 feet wide per clump; underground rhizomes can form much wider colonies.

Bloom: Typically late spring through summer; flowering may be limited or shortened by extreme Phoenix heat. Seed-grown plants may take two or more years to bloom.

Evergreen / deciduous: Herbaceous deciduous perennial; stems normally die back during dormancy.

Growth rate: Moderate initially, becoming fast and colony-forming once established under favorable conditions.