Blue Glow globe thistle is very similar to Veitch’s Blue but larger, growing to four feet or more in the right conditions. Flowers of Blue Glow are described as steel blue. Sea holly ...

Canada thistle (Cirsium arvense) may sound friendly and indeed it has a lovely purple flower, but gardeners and landowners know better. This prickly perennial weed is a menace and is listed as a ...

Thistle do nicely! These purple plants will add dramatic beauty to any garden By MONTY DON FOR MAILONLINE Updated: 17:30 EDT, 26 June 2009 ...

Mulching is a great way to prevent thistle from taking root. Doing so will help keep the plant's seeds from germinating.

The flower cannot be called pretty, so perhaps "striking” is better, and purple and lavender are its usual colors. It was an ancient Scottish symbol for noble birth.

Q. I have Canada thistle growing in two of my flower beds, and I’m concerned about it spreading throughout my garden. I think I brought the seeds in on some manure I had delivered last spring… ...