They flower heads look more like thistles than ... Upright stems carry small, grey-blue, thistle-like flowers that sit on a broad, spiny ruff that adds enormously to their impact.

The Sacramento Mountains thistle is a rare purple flower than can grow to be six feet tall and lives only in wet, high-elevation habitats in the Sacramento Mountains near the town of Cloudcroft, New ...

Bull thistle ... flowers bloom, and one late season - will be needed to suppress the plant (be sure not to mow infestations that are flowering as this will distribute seed) after removal, ensure ...

Scotch thistle ... plant produces flowers, at which time mowers will remove the stem before flowers are formed. Although Scotch thistle often establishes in lawns, especially from seed blown in with ...