I have just bought a bag of Ericacous Compost to Repot some Camellias
from small pots to larger pots.

It says on the bag the contents are about 80% peat.

As i want to keep the camellias long term in the new pots would it be
advisable to add some ordinary garden soil to provide a range of
*Minerals*, which i have been told are not necessarily in the Peat?

If this is so, what percentage of ordinary garden soil would you suggest
mixing with the Ericaceous Peat please?

Many thanks for any advice.