Maureen, we live in the mallee, gets a bit hot in the bag but that could be a different way of looking into it.
If I dig the bag into the ground and cover with straw may work.
But I wont to get a trailer of pig mulch from the local pig farm , Been saying that for a bit just need to get off me a## and do it that should work.
But good cooking tips tar will try some.
Brett