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Hi all

I could find a nursery where he has Generic potting soil with leaf mold in it.
He also said that he has vermicompost which can be mixed with it.
Is it safe to use his combination of Generic potting soil with leaf mold + vermicompost,or only Generic potting soil with leaf mold will do?
If his mixture is safe,what should be the mixing ratio of vermicompost to the Generic potting soil with leaf mold?

Thanks
Ravi