Wax Jambu Tree in a 3 Gallon Container. The wax jambu is an excellent fruit known for its crisp texture, mild flavor, and cooling effect on the body. The flavor is somewhat like an apple with a hint of rosewater. They are often used as a garnish, in fruit salads, and eaten out of hand. The trees fruit prolifically in just one to two years, and they are an excellent treat on hot summer days. Trees can easily be maintained at ten to twelve feet, with biannual pruning. Can be grown in a container.