Taplow Blue Globe Thistle
The Taplow Blue globe thistle is a robust, upright herbaceous perennial, with divided, prickly dark green leaves. Rounded, steel-blue flower heads bloom on branched, leafy stems in the summer. It takes two to five years to reach a maximum height of one and a half metres, and is hardy enough to withstand even the coldest of continental winters (less than -20 degrees Celsius).