Hybrid (Kentucky X Texas) Bluegrasses
for Turf Use in Colorado

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In the 1990s, Dr. James Read of Texas A&M University, successfully crossed Kentucky bluegrass (Poa pratensis) and Texas bluegrass (Poa arachnifera, a bluegrass species native to the Panhandle of Texas). He named the first commercially available variety ‘Reveille’. There are a number of potential advantages to using these Kentucky x. Texas bluegrass hybrids for lawn and sports turf applications in Colorado. The following observations and comments are based on limited research at CSU, as well as field observations and testimonials from sod producers and those who have planted these hybrids in the Western United States.

  1. Excellent heat tolerance. This grass, in fact, seems to grow better the warmer it gets in the summer. The growth and vigor of most Kentucky bluegrass varieties will generally decline under high heat (upper 80s to 100s), which can reduce its traffic and wear tolerance during the hottest times of the growing season. The hybrid bluegrasses appear to maintain more active summer growth, which translates into better traffic tolerance and ability to recover from traffic injury.

  2. Deep and extensive root production. These hybrids produce an extensive root system, which can enhance heat and drought resistance. A dense root system will also improve traffic tolerance, ability to recover from wear, and will improve footing (traction) in a sports turf application.

  3. Extensive and aggressive rhizome formation. These grasses form large, extensive and aggressive rhizomes (underground stems). Different from roots, rhizomes contain growing points that produce new grass plants. Grasses that produce rhizomes are better able to tolerate traffic and will recover more quickly from traffic-induced wear – often without the need to reseed the worn areas. An aggressive rhizome system also means better traction in a sports turf situation.

  4. Low mowing height tolerance. Its excellent heat tolerance and aggressive root and rhizome formation characteristics allow this grass, when necessary, to be mowed at lower heights than many Kentucky bluegrasses – especially during the heat of summer. This can be important for “showcase” sports turf applications.

  5. Potential to require less irrigation. Variability exists among the hybrid bluegrasses with respect to irrigation requirement and drought resistance. Research has shown some of them to possess very good drought resistance (compared to other bluegrasses, and even to tall fescue), where as other varieties are only moderately (or have poor) drought resistant. The ability to sustain growth and vigor with less irrigation results from deeper roots and its excellent heat tolerance.

Commercially Available Hybrid Bluegrass Cultivars

  • Fahrenheit 90 (Mountain View Seeds)
  • Fire and Ice (Turf Merchants)
  • Longhorn (Scotts Turf-Seed)
  • Bandera (Seed Research of Oregon)
  • Spitfire (Seed Research of Oregon)
  • Reveille (Gardner Turfgrass)
  • Dura Blue (Scotts)
  • Solar Green (Scotts)
  • Thermal Blue (Scotts)
  • Thermal Blue Blaze (Scotts)

Inclusion of cultivar or variety names does not imply any endorsement, nor does exclusion imply criticism.

Availability of grasses named here is not guaranteed; see your local seed supplier for availability.

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Author: Tony Koski, PhD, Extension Turf Specialist, Department of Horticulture & LA, Colorado State University.

  • CMG GardenNotes are available online at www.cmg.colostate.edu
  • Colorado Master Gardener/Colorado Gardener Certificate Training is made possible by a grant from the Colorado Garden Show, Inc.
  • Colorado State University, U.S. Department of Agriculture, and Colorado counties cooperating
  • Extension programs are available to all without discrimination.
  • Colorado Master Gardener LogoNo endorsements of products mentioned is intended nor is criticism implied of products not mentioned.
  • Copyright. 2012. Colorado Master Gardener Program, Colorado State University Extension. All Rights Reserved. CMG GardenNotes may be reproduced without change or additions, for nonprofit educational use.

Revised January 2012

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