Blue sea holly is a silver-blue annual perennial herb known by many names: eryngium, eryngo, sea holly, blue sea holly, and big blue. Though it borrows the name, it is not a holly. I would call blue sea holly a thistle. It has spiny leaves and a spiny, bulbous, dome-shaped umbel that makes it deer proof. Deer might get a mouthful of blue sea holly once but never again.
Click here to read blog...