@SarahAndQuack My “lawn” is a mixture of standard meadow grasses (I’d be surprised if yours was pure couch), and tussocky enough for me to have had a bumblebee nest in it. I was very proud. I leave it to grow till late July.
I grow new crocuses in a pot the first year for a nice indoor display, then when the foliage dies down or I get around to it, I grub around the lawn for gaps, drive a trowel in, push to one side, and drop three crocuses into the slit. And repeat. Or I dig up a dandelion and replace by crocuses.
in other words, crocuses are tough.