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Trees

  • 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.

 


Tree for 2008

Bosnian Pine

Pinus heldreichii

Bosnian Pine is a slow-growing evergreen with a dense pyramidal form when young. It has the potential to grow to 70' tall in its native environment but is more likely to reach only 25 to 30' in the landscape. In the Pirin Mountains of Bulgaria there is a 70' tall Bosnian Pine estimated to be over 1300 years old! Young cones are purple and turn brown as they mature and the seed they produce is edible. Bosnian Pine prefers full sun and once established is quite tolerant of high pH soils and drought. It is also disease resistant and can be used in the landscape where an evergreen or pine is desired and space is limited.

  • Exposure: Full sun
  • Soil: Tolerant of dry and high pH soils
  • Hardiness: USDA Zone 6

 

 

Shrub for 2008

American Beautyberry

Callicarpa americana

American Beautyberry is a native deciduous shrub that produces inconspicuous lavender flowers in mid summer but as fall approaches the plant becomes laden with brightly colored clusters of purple fruit producing a striking display. American Beautyberry prefers light shade or protection from the afternoon sun in Oklahoma. It grows from 5 to 10' high and just as broad but overgrown plants can be rejuvenated by cutting them to the ground in winter without sacrificing fruit since the flowers are produced on new growth. This native shrub can be massed as an informal hedge, incorporated into a mixed border, or used as an understory plant in a naturalistic garden setting. White fruited cultivars are also available.

  • Exposure: Light shade
  • Soil: Moist, well-drained
  • Hardiness: USDA Zone 6

 

 

 

Perennial for 2008

Hellebore

Helleborus

Hellebores, also known as Lenten Rose, belong to a genus of mostly evergreen herbaceous plants that are prized for their ability to flower in late winter. The flower stalks rise out of the leaf litter or through the snow to display nodding flowers that range in color from green to white, yellow, or even purple with some cultivars producing spotted flowers. Recently hybrids have been selected for outward-facing flowers and brighter colors increasing their garden value. Hellebores are tough plants requiring little special care other than shade and pruning of old foliage. They are excellent for the woodland garden as understory plants where they will be protected by shade.

  • Exposure: Shade
  • Soil: Moist, well-drained
  • Hardiness: USDA Zone 6

 

 

 

Annual for 2008

Spilanthes

Acmella oleracea 'Peek-A-Boo'

‘Peek-A-Boo’ Spilanthes was selected for its yellow flowers, each with a red eye poking up out of the foliage. The green foliage has a purple tinge in full sun turning more purple as fall approaches and the foliage can be used in salads or cooked as a green. Spilanthes is also known as the Toothache Plant because it has been used to numb pain. In the garden it is a great conversation piece when combined with other plants in a mixed container or it can be used as a flowering groundcover growing 12 to 15 inches tall and spreading 24 to 30 inches.

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