Paeonia Garden Treasure (Itoh) Large semi double ruffled yellow flowers with an orange eye. Itoh Peonies or intersectional peonies are hybrid cultivars from a lutea (tree) and lactiflora (herbaceous) cross. This cross has resulted in an extremely hardy and adaptable plant with sturdy stems and flowers much like the tree peonies. Best grown in full sun for optimal flowering. They will grow in most moist soils but additional lime and blood and bone twice a year is beneficial. They will need a couple years to settle in and mature to flower to their true potential.