...knee high thistles...

That all you got? Mine literally block the sun.

I've got Palm Warblers and Goldfinches up in that shit, and the flowers are absolutely covered in bees right now.

Also my yard sparkles at night. I'll probably take the thistle down when it looks like its going to seed, since it's not native, but while it's providing useful habitat and not spreading, I'm going to let it be.