the plant was accidentally introduced to North America by seed and grain imports and spread easily through contaminated hay. Bull thistle starts out life as a prickly ground-hugging rosette that ...

One of the weeds nearly everyone recognizes is the thistle. There are numerous thistles but the ones that make the Prohibited Weed List in Minnesota are the Canada thistle and the plumeless ...

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 ...