Planting new green ash trees is no longer recommended given the susceptibility of this tree to the emerald ash borer. Fraxinus pennsylvanica ‘Patmore’ Fast-growing tree with long narrowish compound leaves (leaves composed of two or more leaflets on a common stalk). at 4 ft. above ground. Green ash can grow to 70 feet (21 m.) tall and … Leaves glossy green, turn bright yellow in fall. Basically, this is the strongest Ash Tree available. Potential disease problems include fungal leaf spots, powdery mildew, rust, anthracnose, cankers and ash yellows. Patmore Ash or Fraxinus pennsylvanica ‘Patmore’ is a male green Ash cultivar that was discovered as a chance seedling (a mutation of unknown parent plants) in Vegreville, Alberta in 1967. Mature trees with smooth leaves and branches are known as Green Ash. According to Gardenerdy.com there are over 60 species of ash tree across the globe. It is exhibiting new growth throughout the canopy. For the best experience on our site, be sure to turn on Javascript in your browser. If you are considering growing green ash trees, you’ll need to consider its size. It shades many parks, large yards, and other sizable areas and provides exquisite fall color ranging from yellow to deep purple and maroon. As with white ash, the wood of green ash is commercially used for a variety of products including tool handles, oars, garden furniture and sports equipment.Genus name is the classical Latin name for ash trees.Specific epithet means of Pennsylvania. Gray-brown bark develops distinctive diamond-shaped ridging on mature trees. Rarely or never fed on by Japanese beetles. How to Prune Ash Trees. Feed with a general purpose fertilizer before new growth begins in spring. Spring and tree disease go hand in hand, and anthracnose is a disease that can hinder leaf growth on trees like ash, maple, oak or sycamore. The leaf tissue develops a characteristic twisted or wrinkled appearance. These pests weaken the tree and can create serious problems if not addressed quickly by trimming back ash trees. The leaves of an ash tree appear in spring and are then shed in autumn. The white ash is a handsome tree native to North America. Extremely hardy, it has shown no disease and only minor insect problems. This page is for reference only. Flower and fruit: Clusters of small male and female flowers bloom on separate plants before leafout; female trees produce tan, single-winged seeds. Rust: In the spring along the East Coast, yellow-orange spots form on the leaves of white and green ash. 'Patmore' is a vigorous, pyramidal tree with a strong central leader, ascending branches and a symmetrical, rounded crown. The emerald ash borer (Agrilus planipennis), also known by the acronym EAB, is a green buprestid or jewel beetle native to north-eastern Asia that feeds on ash species.Females lay eggs in bark crevices on ash trees, and larvae feed underneath the bark of ash trees to emerge as adults in one to two years. Green ash is primarily dioecious (separate male and female trees). Brittle branches are susceptible to damage from high winds and snow/ice. 'Patmore' is very similar in appearance to F. pennsylvanica 'Marshall' (also known as 'Marshall's Seedless'). The trunk circumference is 18 in. Tree size: Green ash is a fast-growing tree, reaching 50 to 60 feet tall at maturity. It was first discovered in the U.S. (southeastern Michigan) in 2002. Green ash trees have compound leaves with 5 to 9 leaflets, each of which can grow as long as your hand. Pinnately compound leaves are 10”-12” long and 5”-7” wide with opposite leaflets. 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