Mushroom compost is largely peat and I avoid it for that reason.

I find a good quality composted bark very effective - and it lasts longer
than peat plus it has better water retaining properties.

pk




I used to work on a mushroom farm and as far as I know mushroom compost
is sterelised horse shit and straw. When we got it delevered it came in
700 plastic sacks (bin bag size) per shed to which we added 2-3 cm of a
peat/gravel mix on the top of each sack.

K