The Kieffer pear tree (Pyrus communis x P. pyrifolia) is a hardy, fast-growing hybrid, popular for its high yields of large, golden-yellow fruit, which are excellent for canning, baking, and preserving. Thriving in USDA zones 4-9, this fire blight-resistant tree reaches 15-25 feet, bears fruit young (2-3 years), and is largely self-fertile, though it benefits from another tree for higher yields.