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Selections for 2005

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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 2005

Cedar Elm

Ulmus crassifolia

Cedar elm can thrive in almost any soil type, including the alkaline and heavy soils common in Oklahoma. It is one of the more disease resistant native elms, producing glossy green leaves in early spring that turn a muted yellow in the fall. Its form can vary from upright-oval to broadly horizontal and it generally matures around 60' tall. It can be distinguished from other elms by its rough-textured leaves, corky projections on young stems, and flowers and fruit produced in the fall.

  • Exposure: Full sun
  • Soil: Tolerates a wide range of conditions
  • Hardiness: USDA Zone 6




Vine for 2005


Bignonia capreolata

A true beauty, especially in the spring when ‘Tangerine Beauty’ is covered in orange, trumpet-shaped flowers. This semi-evergreen vine can climb by twining its branches around a structure or can use its adhesive tendrils to cling to a wall, easily reaching heights of 30' or more. As temperatures cool in the fall, the leaves have a purple cast and are evergreen during a mild winter or in a protected spot. Beauty is not the only reason for using Crossvine; it is also a tough plant, tolerant of heat and drought once established.

  • Exposure: Full sun to part shade
  • Soil: Tolerates a wide range of conditions
  • Hardiness: USDA Zone 6




Perennial for 2005

Perennial Plumbago

Ceratostigma plumbaginoides

Perennial plumbago is a neat, well-behaved plant that grows 8" to 12" high and spreads to 18" making it welcome at the front of a mixed border or massed as a ground cover. The terminal clusters of blue flowers appear from summer through fall when the foliage turns a bronze-red before going dormant for the winter. It is best to use perennial plumbago in a well-drained soil and to cut old stems to the ground each spring for vigorous re-growth.

  • Exposure: Partial shade to full sun
  • Soil: Well-drained
  • Hardiness: USDA Zone 5




Annual for 2005

Summer Snapdragon

Angelonia angustifolia

Summer snapdragon is a tropical sub-shrub that can be used as an annual in Oklahoma and will bloom from summer until the first frost. Orchid-like flowers are produced on 2' tall spikes and depending on cultivar, flower color ranges from blue to purple, pink, or white with bicolor forms also available. Summer snapdragon may be used as a bedding plant, to add color to a mixed border, or in a container. It is drought tolerant and loves full sun and summer heat.

  • Exposure: Full Sun
  • Soil: Well-drained
  • Hardiness: Use as an annual