The purple flower heads may look pretty, but don't let that fool you. 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 ...

Milk thistle has been used for its purported medicinal properties for thousands of years, but its supplement form didn't explode until recently. Milk thistle supplement sales in the U.S. reached $95 ...