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 ...

It is often very gregarious, especially during the nonbreeding season, when it flocks to roadsides and brushy fields to feed on thistle ... with white undertail coverts. Jet black cap.

As with the prickly sow thistle and hawksbeard, the sow thistle has fluffy white pappus attached to its seeds which helps them blow around in the wind. There are no particular control problems with ...