Fraxinus velutina ‘Rio Grande’
Fairly fast-growing trees, most of which tolerate hot summers, cold winters, and many kinds of soil, including alkaline sorts. Chiefly used as street, shade, lawn, and patio shelter trees. In most cases, leaves are divided into leaflets. Male and female flowers (generally inconspicuous, in clusters) grow on separate trees in some species, on the same tree in others. In the latter case, flowers are often followed by clusters of single-seeded, winged fruit, often in such abundance that they can be a litter problem. When flowers are on separate trees, you’ll get fruit on a female tree only if a male tree grows nearby.
Ash trees are prone to borers. In some parts of California, ash whitefly is a problem; these chalky white, 1/8-in.-long insects colonize in patches on leaf undersides. Outbreaks are usually controlled by natural enemies; avoid spraying with broad-spectrum insecticides, which are likely to wipe out these beneficial predators.Fraxinus velutina
Native to the southwestern U.S. and Mexico. This deciduous tree withstands hot, dry conditions and is cold hardy to about –10°F/–23°C. Grows to about 30 ft. (possibly to 50 ft.) tall. Pyramidal when young; spreading to 30–40 ft. wide when mature, with a more open form. Leaves are divided into three to five narrow to oval, 3-in.-long leaflets; they turn bright yellow in fall. Male and female flowers on separate trees.‘Rio Grande’
Thrives in hot, dry climates and alkaline soils. Has larger, darker green, more succulent leaflets than ‘Modesto’; they turn golden yellow in late autumn. Foliage is resistant to windburn.
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