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Trees

  • Hornbeam - 2020 Carpinus species
    Hornbeam
    2020 Carpinus species
  • Hornbeam - 2020 Carpinus species
    Hornbeam
    2020 Carpinus species
  • Hornbeam - 2020 Carpinus species fruit
    Hornbeam
    2020 Carpinus species fruit
  • Vanderwolf Pyramid, Limber Pine - 2019 Pinus flexilis
    Vanderwolf Pyramid, Limber Pine
    2019 Pinus flexilis
  • Vanderwolf Pyramid, Limber Pine - 2019 Pinus flexilis
    Vanderwolf Pyramid, Limber Pine
    2019 Pinus flexilis
  • Japanese Zelkova - 2018 Zelkova serrata 'Schmidtlow Wireless'
    Japanese Zelkova
    2018 Zelkova serrata 'Schmidtlow Wireless'
  • Japanese Zelkova - 2018 Zelkova serrata 'Musashino'
    Japanese Zelkova
    2018 Zelkova serrata 'Musashino'
  • Japanese Zelkova - 2018 Zelkova serrata 'Ogon'
    Japanese Zelkova
    2018 Zelkova serrata 'Ogon'
  • Fringetree - 2017 Chionanthus cultivars
    Fringetree
    2017 Chionanthus cultivars
  • Fringetree - 2017 Chionanthus Virginicus
    Fringetree
    2017 Chionanthus Virginicus
  • Chioanthus - 2017 virgincus
    Chioanthus
    2017 virgincus
  • Chionanthus Fruit - 2017 Chionanthus
    Chionanthus Fruit
    2017 Chionanthus
  • Escarpment Oak - 2016 Quercus fusiformis
    Escarpment Oak
    2016 Quercus fusiformis
  • Escarpment Live Oak - 2016 Acorn
    Escarpment Live Oak
    2016 Acorn
  • Hedge Maple - 2015 Acer campestre
    Hedge Maple
    2015 Acer campestre
  • Desert-willow cultivars - 2014 Chilopsis liners
    Desert-willow cultivars
    2014 Chilopsis liners
  • Desert-willow cultivars - 2014 Chilopsis Flower
    Desert-willow cultivars
    2014 Chilopsis Flower
  • Winterberry Euonymus - 2013 Euonymus bungeanus
    Winterberry Euonymus
    2013 Euonymus bungeanus
  • Chinkapin Oak - 2012 Chinkapin Oak
    Chinkapin Oak
    2012 Chinkapin Oak
  • 'New Harmony' American Elm - 2011 Ulmus americana
    'New Harmony' American Elm
    2011 Ulmus americana
  • Indian Cherry - 2010 Rhamuns carolinians
    Indian Cherry
    2010 Rhamuns carolinians
  • Arizona Cypress - 2009 Cupressus arizonica
    Arizona Cypress
    2009 Cupressus arizonica
  • Bosnian Pine - 2008 Pinus heldreichii
    Bosnian Pine
    2008 Pinus heldreichii
  • Oklahoma Redbud - 2007 Cercis canadensis var. texensis
    Oklahoma Redbud
    2007 Cercis canadensis var. texensis
  • ‘Prairifire’ Crabapple - 2006 Malus ' Prairifire'
    ‘Prairifire’ Crabapple
    2006 Malus ' Prairifire'
  • Cedar Elm - 2005 Ulmus crassifolia
    Cedar Elm
    2005 Ulmus crassifolia
  • Cedar Elm - 2005 Ulmus crassifolia
    Cedar Elm
    2005 Ulmus crassifolia
  • Shantung Maple - 2004 Acer truncatum
    Shantung Maple
    2004 Acer truncatum
  • Kentucky Coffee Tree - 2003 Gymnocladus dioica
    Kentucky Coffee Tree
    2003 Gymnocladus dioica
  • Bur Oak - 2002 Quercus macrocarpa
    Bur Oak
    2002 Quercus macrocarpa
  • Shumard Oak - 2001 Quercus shumardii
    Shumard Oak
    2001 Quercus shumardii
  • Bald Cypress - 2000 Taxodium distichum
    Bald Cypress
    2000 Taxodium distichum
  • Chinese Pistache - 1999 Pistacia chinensis
    Chinese Pistache
    1999 Pistacia chinensis

Oklaoma Proven! logo.jpg

 

Oklahoma Proven is a plant promotion program coordinated by faculty in the Department of Horticulture and Landscape Architecture at Oklahoma State University. The goal of the program is to recommend plants well-adapted for use across Oklahoma.

 


Collector's Choice for 2009

Persian Parrotia

Parrotia persica

Persian Parrotia is a small tree reaching only 20 to 30’ tall and can spread almost as wide. Interesting deep-maroon flowers appear in late winter. Leaves have a reddish color when appearing in spring, change to a lustrous green in summer, and can be a brilliant yellow or orange in fall. As the tree ages the bark exfoliates into patches of green, cream, and gray adding to the year-round interest of this tree. It is very heat and drought tolerant once established but appreciates some protection from the afternoon sun.

  • Exposure: Light shade
  • Soil: Moist, well-drained
  • Hardiness: USDA Hardiness Zone 5

 

 

Tree for 2009

Arizona Cypress

Cupressus arizonica

Arizona cypress is a drought tolerant, evergreen tree native to the southwestern United States. In the landscape it usually reaches a height of only 20’ to 25’ and 15’ wide. The foliage can be a gray-green but usually blue-foliage and recently yellow foliage forms are available in the trade. ‘Blue Ice’ and ‘Carolina Sapphire’ are common cultivars and ‘Cookes Peak’ is a selection from Cookes Peak, New Mexico with silvery-blue foliage and pyramidal form (see photograph). Arizona cypress require well-drained soil and thrive in hot, dry environments. As the tree ages, the bark exfoliates beautifully becoming mottled with patches of burnt orange and green.

  • Exposure: Full sun
  • Soil: Well-drained
  • Hardiness: USDA Zone 7

 

 

 

Shrub for 2009

Chokeberry

Aronia

There are two species of importance in the genus Aronia, Red Chokeberry (Aronia arbutifolia) and Black Chokeberry (Aronia melanocarpa). As their common names suggest, fruit color is the major difference between the two. Both produce clusters of white flowers in spring, have excellent red fall foliage, grow about 10’ high, and thrive in almost any soil type. ‘Brilliantissima’ is a popular cultivar of Red Chokeberry, chosen for its more compact size and abundance of red fruit. Both species are excellent wildlife plants, but Black Chokeberry gets a lot of attention as a “super fruit” for its high levels of antioxidants and can be used to make juice, jelly, or wine. Aronia work well massed in naturalized settings or at the back of a border since the stems are usually bare near the base leaving room for garden perennials.

  • Exposure: Sun to part shade
  • Soil: Tolerant of most soils
  • Hardiness: USDA Zone 4

 

 

 

Perennial for 2009

Mexican Feather Grass

Nassella tenuissima

Mexican feather grass is a fine textured clumping perennial that waves its silvery flowers in the slightest breeze. It is drought tolerant and tough despite its refined appearance and forms a clump almost two feet tall and three feet wide as the leaves arch to the sides. It tolerates a wide variety of conditions, but prefers well-drained soils and does not like to be cut to the ground in spring like other grasses. Remove only the top third of the plant to rejuvenate. It is native to prairies in Texas, New Mexico, and south to central Mexico and may reseed in the garden.

  • Exposure: Full sun to part shade
  • Soil: Well-drained
  • Hardiness: USDA Zone 7

 

 

 

Annual for 2009

Diamond Frost® Euphorbia

Euphorbia 'Inneuphdia'

Euphorbia is a fine-textured mounding plant used as an annual in Oklahoma. The simple white flowers bloom from spring until first frost and the plant forms a 2’ to 3’ sphere. Diamond Frost® can be used as a mass planting, alone in a container, or mixed with almost any other plant. Its fine sprays of foliage and flowers will weave through other plants making it a perfect complement for almost anything from poinsettias to petunias. It is an excellent background plant, filler, or specimen, proving to be an extremely beautiful and versatile new introduction.

  • Exposure: Full sun to part shade
  • Soil: Moist, well-drained
  • Hardiness: Use as an annual