Milk thistle (Silybum marianum) can be a pain if it's growing in your yard.It's non-native and can be an invasive plant, as Keri Wilson, horticulturist and writer for Garden Media Group, points out, ...

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 ...

Harvest the immature flower heads (buds) before the bracts start to open or you will be eating tough artichokes. Or let one or more flowers open into a large purple thistle; it can be dried and ...