What is it? Rattlesnake Master, also known as Eryngium yuccifolium, is a perennial herb of the parsley family
Native to where? It is native to the tallgrass prairies of central and eastern North America.
Hardiness Zone: Plants are hardy from USDA Hardiness Zones 4 to 9.
What does it look like? It grows up to 5 feet tall. This unique wildflower is best known for its bristly, bluish-green, spherical flowers.
Bloom Time: The flowers are produced in June, July, and August.
Growth Habit: The root system consists of a central taproot surrounded by thick fleshy fibrous roots.
Growing Conditions: It prefers full sun in dry to medium soil of clay, loam, or sand.
Environmental Benefits: The flowers attract many insects, including bees, flies, beetles, butterflies, and wasps. The highly textured flowers and leaves are unpalatable to both deer and rabbits.
Source:
https://www.prairienursery.com/catalogsearch/result/?q=Rattlesnake+Master
https://en.wikipedia.org/wiki/Eryngium_yuccifolium
Image Source:
By Eric Hunt - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=91919813