7/25/2023 0 Comments Acorn and oak leaf tags![]() VIDEO created by Ryan Contreras for “Landscape Plant Materials I: Deciduous Hardwoods and Conifers or Landscape Plant Materials II: Spring Flowering Trees and Shrubs” a plant identification course offered by the Department of Horticulture at Oregon State University Profile Video: See this plant in the following landscape: Cultivars / Varieties: Oaks are susceptible to many diseases including oak wilt, chestnut blight, shoestring root rot, anthracnose, oak leaf blister, cankers, leaf spots, and powdery mildew. Insects, Diseases, and Other Plant Problems: Insects that may potentially be troublesome include scales, oak skeletonizer, leaf miner, galls, oak lace bugs borers, caterpillars, and nut weevils. fruit is a 1 to 1.5-inch long, narrow acorn with a scaly cap.yellow-greenish, 2-to-3-inch chainlike, male catkin flowers and small clusters of female flowers.alternate, simple, leathery, ovate to elliptical dark green leaves, undersides are whitish and fuzzy, margins are sparsely toothed and wavy.light gray-brown stems, gray fuzz, reddish-brown buds, triangular and pointed.light gray bark with reddish-brown furrows, thick layers of cork.In the United States, it can be grown in warmer winter areas and makes an attractive shade tree.īark: Winter Foliage: Spring, Summer, Fall, and Winter Fruits: Fall In 1991, the tree produced 2646 pounds of raw cork which is enough cork to stopper 100,000 wine bottles. Its cork has been collected over 20 times. The tree is known as Sobreiro Monumental or Whistler's Tree and is over 230 years old. The tree is 53 feet tall and 14 feet in diameter. The world's largest Cork Oak tree is in a small village in Portugal and was planted in 1783. The female flowers produced long, narrow acorns with a shaggy cap that are harvested in the fall. The undersides are white with grayish hairs. Appearing in the spring, the male flowers are inconspicuous yellow-greenish catkins, and the female flowers are short clusters. The leaves of this tree are elliptic to ovate with wavy margins, leathery, sparsely toothed, and shiny dark green on the upper surface. The cork oak bark is light gray and thick, with reddish-brown furrows. Because of the high levels of tannins in the leaves, bark, and acorns, oaks are toxic to horses. It is low maintenance, deer resistant, and drought tolerant. The cork oak is best grown in acidic, well-drained, moist to dry soils in full sun to partial shade. The epithet name, suber, is Latin and is similar to the Greek word syphar which means "a piece of old skin" or "a piece of wrinkled skin." The genus name, Quercus, is the Latin name for oak trees. There are plantations in some European and African countries especially Portugal and Spain that commercially grow the cork oak tree. The Cork Oak is the National Tree of Portugal where half of the world's commercial cork is produced. It is native to western Africa and southwestern Europe and is found in forests and open woodlands. The cork is harvested when the tree reaches 30 to 40 years of age and then every 9-11 years for up to 12 times within its lifetime. The spongy bark of mature trees is used to make wine bottle corks, cork flooring, and other items. Corky bark covers the trunk and major limbs of the tree. It has a short trunk, thick branches, and a rounded crown. Phonetic Spelling KWER-kus SOO-ber DescriptionĬork Oak is a medium to large size attractive broadleaf evergreen shade tree that grows 70 to 100 feet tall and equally as wide.
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