What kind of weeds do you have growing on your lawn?

You have Mullien? I had to order seeds and nurse them into being. They are very picky about where they like to grow.

White clover and dandelions and some of the cat that lives next door's shit.

I don't know for sure but if it wasn't for the weeds I wouldn't have a lawn

Nothing. It grows itself. And I let it grow as I sit and watch 😁

Add to that list pigweed and sow thistle and Canada thistle.