A good way to grown peonies(3 rule)

Rule number 1: remember not to plant your peony too deeply. The tuberous roots must not be planted more than about 2.5cm below the surface. If they are planted any deeper they may give wonderful foliage (some of the intersectional peonies, such as ‘Bartzella’ AGM or ‘Julia Rose’ have finely cut leaves which turn crimson red in the spring and autumn and many of the herbaceous or garden peonies have strong red stems and light green soft foliage) but they simply will not flower. If you have a peony in the garden and it isn’t flowering, it is probably because it has been planted too deeply or it has been buried when you have diligently mulched your borders. Just wait until the autumn and then, taking care not to damage the buds on the roots, lift your peony and re-plant it at the right depth.

Rule number 2: plant your peony in a sunny position. Although many varieties will tolerate some shade (for example Paeonia lactiflora ‘White Wings’) if your peony is in heavy shade it will be reluctant to flower well.

Rule number 3: plant your peony in fertile, free-draining soil. Peonies are not generally too fussy about the soil and are quite happy in chalky or clay soils provided that it is free draining; they don’t like to sit in water in the winter.