That's great. I've got it covered across my patch (formerly lawn). It's absolutely fantastic at keeping the grass down and therefore, I've got so many different wildflowers growing now. My meadow buittercups are about a metre high!
Yellow rattle is also great for pollinators - keep an eye out for the bees landing on it.
It's an annual, so make sure you let it seed before cutting. You'll have loads of it in a few years, if managed correctly.
I started my wildflower meadow about 5 years ago, and every year is different
I'm disappointed the ragged robin hasn't grown as in theory it's perfect growing conditions for it as it's pretty waterlogged all winter.
We've got lots of other things though.
Lots of cuckoo flowers which had a male orange tipped butterfly on it yesterday.
Cow parsley, oxeye daisies, herb Robert, vetch, trefoil, cut leaf geranium, thistles, curly dock (yes I leave them) ☺️
There's a couple of small buttercup type flowers too that I'm still trying to identify. Google lens says ones a type of potentilla and the other a star grass 🤷