I bought a couple of Japanes tree peonies after being impressed by the blooms from several herbaceous varieties that I planted two years ago. The staff member at the nursery advised that I plant the tree peonies in an acidic soil, and she recommended that I get an azalea mix along with Miracid.
However, after reading my gardening book, it was indicated that tree peonies prefer slightly alkaline soils (6.5 to 7.5 ph). We have extremely hard clay soil where we live and I would like to simply grow the peonies in pots.
Do I plant them in the azalea mix or should I disregard the advice from the garden staff and plant the tree peonies in a normal potting mix?
Thank you.
Jeffery