"Cat(h)" writes

:-) Some people have too much time on their hands, or plan to use
their lawns for putting practice.
My lawn is chocfull of weeds, including the selfheal in question, a
couple of patches. Lots of daisies, and white clover, the odd
thistle, docks and god knows what else.
But when clipped tight - which weather permitting I try to do every
week end - it looks lovely and densely green, and it is particularly
nice for a kickaround, or even to lie out on on the couple of days in
the year that that odd shiny hot object appears in the sky.
Between clippings, it is lovely and "enameled" (as they apparently did
in medieval times) with white and gold daisies, purple selfheal and
white clover.
Life's too short to be anal about lawns, in my book :-)

On the same day as the OP posted his plea, I was celebrating because my
lawn has just produced its first clump of self-heal, to go along with
the white clover, daisies, et al.
--
Kay