In article ,
joe wrote:
Thanks for all your advice folks. I'll give them a spray with gyphosate,
leave for 48 hours, turn them over, burry them at least 6 inches deep and if
a lawn springs through my newly planted garden I'll tip my hat to nature.

Unless they are riddled with couch, skip the glyphosate. Upside down
and 2" of soil will prevent almost all grasses regrowing. Upside
down and 12" will stop even couch and ground elder.


Regards,
Nick Maclaren.