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Zones A2, A3, 1-6, 26, 28-45
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Full
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Moderate

Fraxinus pennsylvanica 'Patmore'

Patmore Ash
Oleaceae
Deciduous, Trees

FRAXINUS

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 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 pennsylvanica

Native to eastern U.S. Grows 30 to 40 ft. tall and wide, with a compact, oval crown. Gray-brown bark; dense, twiggy structure. Leaves 10 to 12 in. long, divided into five to nine bright green, rather ­narrow, 4- to 6-in.-long leaflets. Male and female flowers on separate trees. Takes wet soil and severe cold, but foliage burns in hot, dry winds.

'Patmore'

This variety is more cold tolerant than most green ash trees.

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