Corn snakeroot

Pictured above: Corn snakeroot (Eryngium aquaticum) by Eleanor Dietrich. Click on terms for botanical definitions. View post as a PDF.

Corn snakeroot (Eryngium aquaticum) blooms vary in color from a pale whitish-blue to a rich lavender or cornflower blue. Flowerheads are about 1/2” to 1” in diameter, globular and are surrounded by spiny bracts. They are borne near the tops of multi-branched, erect stems. Leaves are sessilelinear and alternately arranged. Leaf margins are entire or may be finely toothed.

Corn snakeroot typically flowers summer through late fall. A variety of pollinators are attracted to its flowers. It occurs naturally in sunny marshes and swamps, along pond edges and in ditches.

The common name snakeroot (also known as rattlesnakemaster, both of which are used to describe the Eryngium genus) may have come from its use in Native American culture as a remedy for snakebite.

Corn snakeroot
Photo by Stacey Matrazzo
Corn snakeroot flowers
Photo by Stacey Matrazzo

Family: Apiaceae (or Umbelliferae) (Carrot or parsley family)
Native range: Eastern and central Panhandle, Santa Rosa County, several counties in north and central peninsula
To see where natural populations of corn snakeroot have been vouchered, visit
Hardiness: 8A–9B
Soil: Moist to wet, acidic soils
Exposure: Full sun to moderate shade
Growth habit: 3–5’ tall
Propagation: Seed
Garden tips: In a home landscape setting, corn snakeroot may require a little more care than other wildflowers. It does not tolerate drought, so soil moisture must be maintained. As well, it is not a very prolific reseeder, so plants may need to be replaced periodically. Despite its maintenance needs, it is an interesting and beautiful addition to a mixed wildflower garden.

Corn snakeroot is sometimes available at nurseries that specialize in native plants. Visit to find a native nursery on your area.

For more information on other Eryngium species, see these resources: