I'm not sure we've ever had prairies in the UK - at least not since stone age times. All the guidance about what to do to increase the biodiversity of your lawn refers back to the management of hay meadows. You've got to cut it at specific times of year and take away the cuttings to reduce soil fertility - which sounds very counterintuitive.

I thought that management of savannas and prairies was all about putting the herds through a couple of times a year to trample a lot of the growth back into the ground and fertilize - thus building up the soil fertility. I hesitate to start a regime that makes the soil poorer, even if that's what most of our wildflowers are adapted to.

IDK. The more I read up about this stuff the less I seem to understand.