"Mike Lyle" wrote in message
...

(snip)
but even that was past its flowery best after about ten years as grasses
got a foothold. Most grasses do this by the simple expedient of being
close-growing, perennial, and having a long growing period limited mainly
by temperature; but, as Phil says, that's part of the natural population.
Nothing wrong with judicious "weeding", of course...

The grasses will only overwhelm the other flowers if an important
constituent of the wild flower flora is missing. This is yellow rattle which
is parasitic on grass roots and keeps the grasses in balance.

Phil