Rattlesnakemaster

(Eryngium aquaticum)

Rattlesnakemaster (Eryngium aquaticum)

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Estimated Native Range
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Summary

Eryngium aquaticum, commonly known as Rattlesnakemaster, is an evergreen perennial herb native to wet meadows, marshes, and savannas in the coastal Eastern United States. This plant typically grows up to 2 meters tall and has a ribbed, erect stem that branches toward the top. The inflorescence is characterized by its unique appearance, featuring spherical flower heads with white to bluish flowers surrounded by spiny, blue-tinged bracts, blooming from late summer to fall. The flowers are quite showy and attract a variety of pollinators.

Rattlesnakemaster is valued for its striking architectural form and its ability to thrive in wet conditions, making it a suitable choice for rain gardens, water features, and naturalized areas. It is also used in traditional medicine. In cultivation, it prefers full sun to part shade and requires consistent moisture, adapting well to soils with slow or medium drainage. While it is generally low-maintenance, it can be susceptible to root rot if drainage is poor.CC BY-SA 4.0

Plant Description

  • Plant Type: Herb
  • Height: 3-4 feet
  • Width: 1-3 feet
  • Growth Rate: Moderate
  • Flower Color: Blue, Purple, White
  • Flowering Season: Fall
  • Leaf Retention: Evergreen

Growth Requirements

  • Sun: Full Sun, Part Shade
  • Water: Medium, High
  • Drainage: Medium, Slow

Common Uses

Bee Garden, Bird Garden, Border Plant, Butterfly Garden, Deer Resistant, Drought Tolerant, Erosion Control, Low Maintenance, Rabbit Resistant, Rock Garden, Showy Flowers, Water Garden

Natural Habitat

Native to wet meadows, marshes, and savannas in the coastal Eastern United States

Other Names

Common Names: Water Eryngo , Rattlesnake-Master , Marsh Eryngo , Corn-Snakeroot , Bitter Snakeroot , Marsh Rattlesnake Master , Panicaut Des Tourbières , Kärrmartorn

Scientific Names: Eryngium aquaticum , Eryngium virginianum , Eryngium plukenetii , Eryngium aquaticum var. normale , Eryngium praealtum

GBIF Accepted Name: Eryngium aquaticum L.