Renkaku means "Flight of Cranes," and that's what comes to mind when this outstanding tree peony blooms in late spring. The pure white, semi-double, upward-facing 8" blooms are exquisite—and attract butterflies and pollinators. Tree peonies are generally stronger, faster growers than their herbaceous counterparts. Grows 3-4' tall with a similar spread. Paeonia suffruticosa 'Renkaku'