shazzbat writes

Most wild flowers grow happily amongst grass, in meadows, riverbanks,
hedgerows etc. They are all complimentary to each other.

Getting seedlings to grow in an established grass sward is a different
matter from allowing plants and grass to develop together.

There is the second point that most grassland in England appears to be
high in nutrient level, under which conditions the grass has a distinct
advantage (along with dandelions). Accepted advice for establishing a
wild flower meadow is now to remove the top layer of turf and soil to
reduce fertility, before sowing a seed mixture including both grass and
flowers.
--
Kay