I wouldn't use mushroom compost as an overwintering insulator for roses. My
personal preference is pine needles, heaped to above the graft point.

Dave

"Anton Jopko" wrote in message
...
Dear Readers,
This spring we planted several roses and they turned out beautifully with
many
blooms. Now we have to worry about the winter.
Is it safe to use mushroom compost to winter protect roses here in zone
5?
a person told me that the compost is high in salt??
Thanks for listening
anton