"Chris Hogg" wrote
All good advice if you've got enough other stuff. But if, like me, you
tend to have a large amount of shreddings from a woody hedge or large
shrubs that are being cut back hard, just bag it all up in old peat or
compost bags
snip

This morning I just pushed my hand quite deep into one of the bags
filled last week. I had to withdraw it sharply; was it hot in there!

Shredded prunings certainly can heat up fast. The first lot we ever
shredded had to sit in a pile on the veg plot for a few days while space
was being cleared to build compost bins. When I came to move the heap I was
amazed to find it had turned to ash in the middle.