A willow acacia, or weeping wattle, is a tall, fast-growing evergreen tree that is native to Australia. It has an upright trunk and drooping branches that give it a weeping appearance. Its leaves are narrow and gray-green in color, and it produces yellow puffball flowers and brown seed pods.
A willow acacia is easy to grow and maintain because it is drought tolerant. It grows up to 3 feet a year; and, it reaches up to 40 feet in height and up to 20 feet in width, according to Horticulture Unlimited, Inc. It survives best in full sun in USDA plant hardiness zones 7 to 10. A willow acacia prefers well-drained soils, but it tolerates several soil types.