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Aquatic Milkweed

Asclepias perennis

Aquatic Milkweed is a vital plant for native and waterwise gardens, thriving in moist to wet environments. It typically grows to a modest 2 feet in height and features lance-shaped, glossy leaves. From late spring to early summer, it produces small, fragrant white flowers that serve as an important nectar source for bees, butterflies, and other pollinators. Like other milkweeds, this plant is especially crucial for monarch butterflies, serving as a host plant on which their caterpillars feed.

Details

Height18” - 24”
Spread18"
Bloom SeasonMay – September
Soil Types
clayClay
loamLoam
sandSand
Soil Moisture
moistMoist
wetWet
Sun Exposure
partSunPart Sun
fullSunFull Sun

Range Map

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Ecological Benefits

Maintenance Tips

  • Prefers consistently moist soil; ideal for planting in bog gardens or near water features where the soil remains consistently moist to wet.
  • Deadhead spent blooms to encourage more flowers. Cut back in late autumn or early spring to promote vigorous new growth.
  • Divide clumps in the spring every few years to rejuvenate and propagate the plant.
  • Monitor for pests such as aphids but manage plants carefully to preserve beneficial insects like monarch caterpillars.

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