Tree peonies are really shrubs with a woody framework so unlike the herbaceous peonies, they do not need yearly pruning. I would try to stimulate flowers on your lazy peony with a dose of Miracle Grow plant food in May and by using a slow release plant food like Osmocote every spring. Is this plant getting at least a half day of sun? Tree peonies without enough sunlight can support beautiful foliage but no blooms. Hope your peony is singing \"this bud's for you\" soon. Keep growing, Marianne Binetti