If they gape with shrinking, fill in between with finely-sifted soil, and roll again and again.
Strictly speaking, a grassplot should be all grass, grass and a little white clover.

"Soldiers" (of the plantain type) are not to be tolerated on a lawn, but I have a weak corner for dog-daisies.

I once owned a little garden in Canada, but never a dog-daisy grew there.

A lady I knew had one--in a pot--sent from "Home." But even if you have a sentimental fondness for "the pretty things" (as their botanical name signifies), and like to see their little white faces peeping out of the grass, this must not be carried too far.

In some soils dog-daisies will soon devour the whole lawn.
How are they, and "soldiers," and other weeds to be extirpated?
There are many nostrums, but none so effectual as a patient digging up (with a long "daisy fork") of plant after plant _by the roots_.