I think, although I am not a hundred percent certain, that they do it to
get rid of the thatch. So the thatch burns away, but the grass w=hich
has roots in the ground regenerates. I think I read that somewhere.
I've also read that it's not toogood for the grass.

Greyhound wrote:
When I was in Mississippi in 1981 I drove buy this guy who was burning his
grass (not the clippings) which was a controlled grass fire. It was dry and
the grass burned and he had a hose which was directing where the burn was
going. If I remember it was a 200 x 200 area. Is there any particular
benefit to this? I did a search but did not turn up anything. It was done
either late fall or late winter.
Thanks
Greyhound
Tampa, FL