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  • 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 2019

'Vanderwolf's Pyramid', Limber Pine

Pinus flexilis

‘Vanderwolf’s Pyramid’ limber pine is an evergreen tree with a pyramidal habit that typically grows 20-30 feet tall and about 10-15 feet wide. The specific epithet and common name is in reference to the flexible (limber) branchlets/twigs. ‘Vanderwolf’s Pyramid’ is noted for its closely spaced, twisted, silvery blue green needles. Limber pine is generally considered to be an adaptable, low-maintenance tree with few problems. Limber pine is native to North America and is considered resistant to pine wilt disease.

  • Exposure: Full sun or light shade
  • Soil: Tolerates wide variety
  • Hardiness: USDA Zone 4-7

 

 

 

Shrub for 2019

Double Take series, Flowering Quince

Chaenomeles speciosa

Flowering quince in the Double Take™ series are hardy, deciduous shrubs reaching 4 to 5 feet high and at least as wide. Plants in the Double Take™ series produce a profusion of early spring double flowers that resemble camellias. This is a dense, broad-rounded, thornless, shrub. Bold double flowers (to 2” diameter) bloom before the leaves fully unfold in an early spring bloom and come in colors of scarlet, orange, pink, and peach. Plants do not produce fruit. Oval to oblong, glossy dark green leaves provide an attractive look through the summer. Prune lightly after blooms in spring when needed. Double Take™ flowering quince is very drought tolerant once established.

  • Exposure: Sun to part shade
  • Soil: tolerates wide variety of soils, but prefers well-drained.
  • Hardiness: USDA Zones 5-9.

 

 

 

Perennial for 2019

Rattlesnake Master

Eryngium yuccifolium

Rattlesnake Master is a native species to the tall grass prairies. Leaves of rattlesnake master are parallel-veined, bristly-edged, sword-shaped, medium green leaves (to 3' long) resembling those of yucca. Flowers are greenish-white and tightly packed into globular, 1" diameter heads resembling thistles. The flowering heads attract many kinds of insects

Rattlesnake master prefers dryish, sandy soils, but tolerates clay and shallow-rocky soils. Plants tend to open up and flop in overly fertile soils or in anything less than full sun. This is a taprooted plant which transplants poorly and is best left undisturbed once established.

Use rattlesnake master in a xeriscape garden, perennial border, or native garden. Group plants in naturalized areas for best affect.

  • Exposure: Sun, part shade
  • Soil: Tolerates about any soil
  • Hardiness: USDA Zone 4-10

 

 

 

Annual for 2019

Graffiti® series, Star Flower

Pentas lanceolata

Considered to be the most uniform in habit as well as bloom time, Graffiti® comes in several colors, pink, purple, bright red, rose and white and grows to 16 inches high and 12 inches wide making it a great plant for containers or in a flower bed.

Graffiti® plants are very heat- and drought-resistant and make great cut-flowers. With its tightly clustered flowers that sit above the foliage in bright colors that have an abundance of nectar, Graffiti® pentas are a sure attractant for butterflies and hummingbirds throughout the summer months.

Like all Pentas, Graffiti® prefers soil that is not too rich; if it's a bit on the dry side, all the better. Heat, sun, and good drainage will have the plants blooming heartily all summer long.

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