Canada thistle (Cirsium arvense) is an aggressive, invasive plant. Here's how it spreads and how to identify it so it doesn't ...
Alluring, like sirens, some vicious weeds produce beautiful flowers in calming purple hues. Here are the problematic blossoms ...
The thistle was named the Scottish national flower by Alexander the III ... and boggy areas with its delicate purple, pink, white, and yellow flowers. In some regions, the plants are seen as weeds, ...