Thistle can spread quickly and will compete with other plants for water and nutrients. To get rid of thistle, simply pull it out of the soil by hand. Mulch can help prevent thistle from coming back.

Easily recognizable due to its vase-shaped purple flowers with dandelion-like seeds, Canada thistle (Cirsium arvense) is a particularly aggressive invasive plant. Despite its name, Canada thistle is ...

Editor’s note: In July, Home & Garden featured a number of questions and answers about common summer problems —earwigs to ash galls — and invited readers to send in more questions. Here’s another in ...