Roses and soils

It may already be obvious to many of you that mushroom compost is absolutely horrible for roses. I had to learn the hard way years ago. There is a lot of salt in that compost. Rotted horse manure has become my standby every year. We now have many horse stables in my area - and one actually is happy to deliver the stuff! Only the stuff collected from cement surfaces.You just have to have room to let it sit for a year.
This exchange on roses has been fantastic! Someone should edit all of it and publish it. bill grant
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