Christina Websell wrote:
Well I had hoped that it would rot down, when the digger made a heap of it,
but now it's just a huge amount of couch grass growing again in a 3 ft high
heapsigh
I guess growing courgettes in it are out of the plan now.

Not necessarily. courgettes are very hard to kill, I wouldn't have
thought the couch grass would do them much harm. They may even shade
it over enough to kill it off a bit