General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Dry Mesic
Minimum cold hardiness: Zone 4a -34.4 °C (-30 °F) to -31.7 °C (-25 °F)
Maximum recommended zone: Zone 9b
Plant Height: 2-5 feet
Plant Spread: 2-3 feet
Leaves: Unusual foliage color
Other: Parallel-veined leaves are spiny; alternate; mostly at base, kind of yucca-like; crushed have carrot smell
Fruiting Time: Fall
Flowers: Showy
Malodorous
Other: Florets form a spherical head, like a golf ball. In bright sun sickly honey scented
Flower Color: Green
Other: Greenish-white (whole flower head may turn purplish with age)
Bloom Size: Under 1"
Flower Time: Summer
Underground structures: Taproot
Uses: Will Naturalize
Wildlife Attractant: Bees
Butterflies
Other Beneficial Insects: beetles, and plant bugs
Resistances: Deer Resistant
Rabbit Resistant
Humidity tolerant
Propagation: Seeds: Self fertile
Stratify seeds: Needs 2 months cold moist treatment.
Other info: may self seed
Pollinators: Wasps
Beetles
Moths and Butterflies
Flies
Bees
Miscellaneous: Tolerates poor soil

Image
Common names
  • Rattlesnake Master
  • Button Eryngo
  • Beargrass
  • Button Snakeroot
  • Bear's Grass
  • Northern Rattlesnake-Master

Photo Gallery
Location: Botanical Garden Leipzig, Germany
Date: 2022-09-17
Location: Ontario, Canada
Date: 2021-07-07
Location: Millersville MD
Date: 2020-03-22
Single young plant emerging in spring
Location: Downingtown, Pennsylvania
Date: 2011-07-27
flower clusters with Blue-winged Wasps
Location: Plano, TX
Date: 2022-06-20
Location: Botanical Garden of Copenhagen
Date: 2014-07-23
Location: Columbus, Ohio USA, Zone 6b
Date: 2018-07-02
Location: all photos from my garden
Date: 2014-07-12
Location: My garden in Ontario, Canada
Date: 2021-07-24
Location: Chicago
Date: 2020-07-12
Location: Burger's Zoo
Date: 2021-08-09
Location: Columbus, Ohio USA, Zone 6b
Date: 2018-07-02
Location: Aberdeen, NC (my garden 2022)
Rattlesnake master # 516; RAB p. 768, 140-4-3; AG p. 211, 48-35-1
Location: IL
Date: 2015-07-16
Location: Plano, TX
Date: 2022-05-21
Location: Hortus Camera Lapidea
Date: 2008-08-16
Location: Columbus, Ohio USA, Zone 6b
Date: 2018-07-02
Location: Pinehurst Arboretum Pinehurst, North Carolina
Date: July 25, 2023
Rattlesnake master # 516; RAB p. 768, 140-4-3; AG p. 211, 48-35-1
Location: IL
Date: 2015-06-14

Courtesy Outsidepride
  • Uploaded by vic
Location: Van der Veer Botanical Gardens - Davenport, Iowa
Date: 7-3-11
Location: Romeoville, Illinois
Date: 2016-07-18
group planting at a bark longhouse at Isle a la Cache Museum
Location: Eckert's Greenhouse, Sterling Hts, MI
Date: 2012-07-30
Location: Plano, TX
Date: 2022-05-21
Location: Burger's Zoo
Date: 2021-08-09
Location: Hortus Camera Lapidea
Date: 2008-07-12
Location: central Illinois
Date: 2008-07-02
native wildflower
Location: Chicago Botanic Garden
Date: 2014-10-25
Location: Downingtown, Pennsylvania
Date: 2010-07-14
the white round flower clusters
Location: Downingtown, Pennsylvania
Date: 2020-10-02
brown seeds in rounded clusters
Location: Eckert's Greenhouse, Sterling Hts, MI
Date: 2012-07-30
Location: Botanical Garden of Copenhagen
Date: 2014-07-23
Location: My garden in southeast Nebraska
Date: 2012-06-26
Location: Texas A&M AgriLife Research & Extension Center, Overton, TX
Date: 2014-06-26
Location: Mississippi
Date: 2013-06-20
Location: Van der Veer Botanical garden, Davenport, Ia.
Date: 2011-07-02
Location: central Illinois
Date: 2011-11-13
Location: Downingtown, Pennsylvania
Date: 2011-07-27
plant in bloom
Location: Downingtown, Pennsylvania
Date: 2010-12-27
a plant in front in winter

Photo courtesy of: Tom Potterfield
Location: Plano, TX
Date: 2018-03-20
Location: Eckert's Greenhouse, Sterling Hts, MI
Date: 2012-07-30
Location: Kentucky
Date: 2004-08-07
Steven J. Baskauf http://bioimages.vanderbilt.edu/
Location: central Illinois
Date: 2011-06-11
Location: Lilburn, GA
Date: 2020-04-29
2 week old seedling
Location: central Illinois
Date: summer 2007
Location: Plano, TX
Date: 2017-03-09

Photo courtesy of Select Seeds
Location: Indiana  zone 5
Date: 2016-09-24
Location: My garden in Ontario, Canada
Date: 2021-07-24
Over five foot tall this year!
Location: Indiana  zone 5
Date: 2016-09-24

Photo Courtesy of Prairie Nursery. Used with Permission
  • Uploaded by Joy

Photo Courtesy of Prairie Nursery. Used with Permission
  • Uploaded by Joy
Location: Vienna, VA
Date: 2017-07-30
seedlings from seeds sowed this spring
Location: Van der Veer Botanical Gardens - Davenport, Iowa
Date: 7-3-11
Location: Mississippi
Date: 2014-06-25
Fragrance of this flower smells remarkably like honey
Location: Downingtown, Pennsylvania
Date: 2010-07-15
several plants in bloom in natural garden
Location: Tampa, FL
Date: 2015-05-02
At USF Botanical Gardens
Location: Downingtown, Pennsylvania
Date: 2010-07-14
the foliage
Location: Indiana  zone 5 Purdue garden
Date: 2016-09-25

photo credit: Dominicus Johannes Bergsma
Location: Downingtown, Pennsylvania
Date: 2020-10-02
a few plants staked
Location: North Carolina Botanical Gardens Chapel Hill, NC
Date: late June 2014
Identified as Northern Rattlesnake-master.
Location: Eckert's Greenhouse, Sterling Hts, MI
Date: 2012-07-30
Location: Tellys Greenhouse, Troy, MI
Date: 2008-08-18
Location: Kentucky
Date: 2004-08-07
Steven J. Baskauf http://bioimages.vanderbilt.edu/
Location: Tellys Greenhouse, Troy, MI
Date: 2008-08-18

Photo Courtesy of Lazy S'S Farm Nursery.
  • Uploaded by Joy
Location: My garden in Kalama, Wa. Zone 8
Date: 2013-08-02
  • Uploaded by Joy
Location: Brownstown Pennsylvania
Date: 2016-06-30
Location: Texas A&M AgriLife Research & Extension Center, Overton, TX
Date: 2014-06-26
Location: Van der Veer Botanical garden, Davenport, Ia.
Date: 2011-07-02
Location: central Illinois
Date: 6-24-11

Photo Courtesy of Prairie Nursery. Used with Permission
  • Uploaded by Joy

Date: 2016-05-14
This plant is tagged in:
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Comments:
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Feb 17, 2018 8:20 PM concerning plant:
    This Rattlesnake Master is a most interesting perennial that got its name from Native Americans brewing a tea from its root to cure snake bites. This is one of those perennials that once planted, it does not have to ever be divided and reset. In fact, because it has a taproot, it should not be divided, leading to death. It self-sows around well. I've grown it in silt-clay loam and clay soil where after several years it either starts to die out as a short-lived perennial or it gets a root rot. Fortunately, it comes back from nearby seedlings, and I've had several plants in my natural garden for about 17 years. Maybe it does not do this in sandy soils. It likes full sun and dry or well-drained soils. It is a good pollinator plant that attracts butterflies, moths, bees, and wasps, especially Blue-winged Wasps. It is native to prairies and meadows from Minnesota & Wisconsin to New Jersey and southward into the deep South, including most of Florida. It is sold by most all native plant nurseries in eastern North America. I'm the only homeowner in my town that is growing some, so it is infrequent in gardens and landscapes. I was very happy to see some planted in a mostly native plant, naturalistic plaza landscape in the downtown area in 2020. It is used a lot in prairie and native plant restorations in forest preserves, land preserves, parks, and arboretums.
  • Posted by plantladylin (Sebastian, Florida - Zone 10a) on Feb 26, 2013 6:22 PM concerning plant:
    Button Eryngo is one of our most distinct native wildflowers here in Florida and is found throughout the state. This plant has a basal rosette of 12 to 36 inches long stiff strap-like bluish-green leaves that taper to sharp points, resembling the leaves of Yucca. Flower stems are 3 to 4 feet tall and the flowers consist of dense clusters of numerous 5-petaled tiny greenish-white flowers with a prickly bract beneath each flower head. Flower heads persist on the plant after blooming.

    Button Eryngo is found in habitats of moist to dry pinelands, marshes, roadsides, and open woodlands.
  • Posted by jmorth (central Illinois) on Oct 28, 2011 6:53 PM concerning plant:
    A native wildflower. The tiny white flowers are tightly packed in 1" dia. round balls. Found in open woods and prairies.
    Indians (Mesquakies) used the root to treat snake bite.
Plant Events from our members
MrsBinWY On April 29, 2017 Seeds germinated
1
MrsBinWY On February 14, 2017 Seeds sown
milk jug; per TC: room temp for 3-4 weeks (move to 24-39 degrees for 2-4 weeks if no germination); 16 seeds from poisondartfrog; put milk jug in fridge 3-22-17; unfridged 4-15-17
antsinmypants On April 10, 2021 Plant emerged
antsinmypants On January 18, 2021 Seeds sown
WS - Jug 12
SuperHappyCamper On March 4, 2023 Obtained plant
Purchased from North Georgia Native Plant Nursery.
WebTucker On July 25, 2023 Bloomed
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