Spaghnum peat moss
As well as mixing into soil, can spaghnum peat moss also be used on top of the soil (not mixed in) to help preserve moisture in the soil as well as preventing weeds from growing?
Certified GKH Gardening Expert
If you have nothing else to use as mulch, you can use spaghnum peat moss, though it would likely blow away very easily.
It would not work well as a weed deterrent, as it is extremely light weight and weeds will push right through it.