The Arizona ash tree (Fraxinus velutina), also referred to as the velvet ash, grows to approximately 50 feet in height. Widely grown as a shade tree, it produces abundant green leaflets that measure 3 to 6 inches in length. The tree produces a bright-yellow fall color. In the winter, the tree is hardy to 0 degrees Fahrenheit. The Arizona ash can be either male or female. The male tree produces an abundance of flowers each spring and the female tree drops numerous winged seeds. The tree often forms multiple stems if not pruned, which makes it more prone to breakage.
Plant the Arizona ash tree in full sunlight. The tree will tolerate wet roots and is often used in areas with poorly draining soil. It will grow in a wide range of soils with ease. Once established, the tree is drought tolerant and you should only provide irrigation to it two to three times per month during hot summers, according to the University of Arizona.
Prune the Arizona ash tree every spring. Remove all stems that threaten to become additional tree trunks. Prune away dead or diseased wood. The Arizona ash produces abundant growth, and it requires thinning of the branches so there is ample airflow, and the sunlight can easily reach within the tree's depth.
Fertilize the Arizona ash tree every spring using a general purpose fertilizer such as a 10-10-10. Apply according to the directions on the label. Water the fertilizer thoroughly into the soil.