Geum (jee-um) Avens; Rose Family (Rosaceae). A sizeable genus of brilliantly colored and generally adaptable border perennials is native to Europe, Asia, North and South America, Africa, and New Zealand. Easily grown in full sun and ordinary soil. From a basal rosette of leaves, Geum produce red, yellow and orange flower shades on lean stalks, in midsummer. Geum species are evergreen except where winter temperatures drop below 0 °F.