Countless types of peony cultivars and varieties exist. However, there are currently just 33 officially recognized species of peony (paeony) plants that make up the Paeonia genus, ...

with a slightly acidic pH range of 6.5 to 7.0. Tree peony varieties can handle more acidic soils than herbaceous or Itoh peonies. I find it’s also beneficial to improve drainage and nutrients by ...