Peonies

As you said, peonies like full sun (6 hrs./day). Plant them in a place where you feel they will stay since they don't like to be disturbed or moved. When you water them do it deeply, i.e. a long time so the water gets to deep roots. A quick, short watering is not good for peonies. Fertilize them in the Spring with a 1-2-1 ratio such as 5-10-5. The first number is nitrogen which is for foliage health and color. the second number is for phosphorus which is good for the flower. The third number is for potassium and it's good for stem strength which is important for peonies.