The Callie Kumquat tree is a hybrid variety known for its compact size and sweet-tart flavor, as it combines the characteristics of the Meiwa and Nagami kumquats. It is an ornamental, evergreen tree that produces small, orange, edible fruit, including the peel. The tree requires at least 6-8 hours of sunlight daily and thrives in well-draining, slightly acidic soil. It is best suited for USDA zones 9-11 and can be grown in containers in colder climates.