Photo by Gary Kurtz
Rattlesnake master, Eryngium yuccifolium, typically grows to a height of 3 to 5 feet and spreads about 1 to 2 feet wide. Its flowers are distinctive, forming tight, ball-like clusters of greenish-white blooms that resemble thistles. These flowers are small, dainty, and tightly packed, with white stamens extending into pointed bracts. The leaves of rattlesnake master are long, narrow, and sword shaped. They are blue green in color, with parallel veins and stiff spines along the margins. This plant thrives in full sun and is commonly found in prairies, rocky woods, glades, and meadow habitats, preferring dry, sandy, or well-drained soils. (July)