Marsh Rattlesnake Master
Eryngium aquaticum
Marsh rattlesnake master is one of the most visually arresting natives for wet conditions. It produces an upright branched structure with stiff, spiny, bluish-green foliage and globe-shaped blue flower heads in midsummer that look like they belong in a coastal garden on another continent. The flowers glow a cool steel-blue and attract a dense rotation of short-tongued pollinators who appreciate the open, accessible head structure. A plant for collectors and plant lovers who want something genuinely unusual and ecologically important in a wet or rain garden setting. The seed heads hold their structural interest through fall and winter, adding a sculptural element that most perennials can't offer. Quite different from prairie rattlesnake master (Eryngium yuccifolium) in both looks and habitat preference.
We grow a range of sizes and prices. Add the plant to your list, then pick your size when you visit.
Final price confirmed at pickup, depends on size and season.
- Thu, Jul 238 AM – 4 PM
- Fri, Jul 248 AM – 4 PM
- Sat, Jul 258 AM – 2 PM
A nursery-grown plant, ready for the ground.
Healthy, container-grown marsh rattlesnake master propagated on-site at Hill House from regional genetics. Includes a one-page care card. We make every effort to supply plants as listed; occasionally we substitute a similar species of equal value.
- Sun
- Full sun
- Water
- Moist
- Mature size
- 2'–4'
- Bloom
- Steel-blue globe flowers July through August; structural seed heads hold through winter
- USDA zones
- 6-9
Pairs well with these.
Same light, same soil, same wildlife. Janet's picks to plant alongside marsh rattlesnake master.
Or skip the guesswork.
Curated packages bundle 9–12 species that work together. One reservation, one pickup day, a printed layout map.
Butterfly Package
Host and nectar plants chosen to feed monarchs, swallowtails, and fritillaries spring through fall.
Hummingbird Package
Tubular-flowered natives that pull ruby-throats through your yard April through October.
S.O.S. Package
Save Our Songbirds, berry- and seed-bearing natives that feed nesting and migrating birds.