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Selections for 1999

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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 1999

Chinese Pistache

Pistacia chinensis

Chinese pistache reaches a height of 30’ to 45’ with only a slightly smaller spread. Brilliant yellow leaves may grace the tree in autumn. Chinese pistache is a tough tree tolerant of drought, heat, and heavy soils.

  • Sun Exposure: Full
  • Soil: Tolerates a wide range of conditions including dry and alkaline soils
  • Hardiness: USDA Zone 6

 

 

 

Shrub for 1999

Oakleaf Hydrangea

Hydrangea quercifolia

Oakleaf Hydrangea holds its bronze-tinted fall foliage into early winter, giving the plant a long season of interest while other garden plants are disappearing. The cinnamon buds that open to cone shaped white flowers also add interest, and the oak-like leaves give this 6’ to 8’ high shrub a coarse but graceful texture.

  • Sun Exposure: Shade
  • Soil: Moist, well-drained
  • Hardiness: USDA Zone 5

 

 

 

Perennial for 1999

'Powis Castle'

Artemisia 'Powis Castle'

With dense mounds of lacy silver foliage, this perennial reaches a height of 3’ and remains evergreen during mild winters. It is prized for its feathery foliage and its drought tolerance.

  • Sun Exposure: Full sun to part shade
  • Soil: Well-drained
  • Hardiness: USDA Zone 5

 

 

 

Annual for 1999

Purple Fountain Grass

Pennisetum setaceum

Growing 3’ to 4’ high, this heat and drought tolerant plant blooms all summer until frost. It provides dramatic accent in sunny beds and borders, with purple leaves and bristled flower spikes providing color and texture throughout the season.

  • Sun Exposure: Full
  • Soil: Moist, well-drained
  • Hardiness: Use as an annual