|Paeonia lutea is an upright, sparsely branched tree peony with dark green leaves, divided into 9 leaflets. Produces horizontal to nodding, single, cup-shaped, vivid yellow flowers, 2 1/2 inches across. S.W.China. Plant in well prepared garden beds, with organic matter worked in. They respond well to a yearly fertilization, and addition of bonemeal. Tree peonies come in a variety of colors, including yellows and purples.