Over the past decade, colorants have become an increasingly popular alternative to overseeding warm-season turf thanks to improved product performance, lower costs, reduced water requirements, and simpler management when compared to overseeding. For golfers, the biggest advantage for courses choosing colorants instead of overseeding is that playability will be far superior on non-overseeded surfaces in October and November than overseeded surfaces, and the course may not have to close for overseeding. A smoother transition into late spring and summer is another benefit. The trade-off is that dormant turf with colorants applied still cannot recover from wear, so playing conditions in high-traffic areas will decline through the winter, while a fully established overseed provides more-consistent playability from winter into spring.
If your course is already using colorants or thinking about trying them as an alternative to overseeding in the future, I want to highlight some important tips and limitations to be aware of.
Recommendations for Colorant Use
Apply when growth slows but turf remains green: To provide a seamless color transition, apply colorants early and routinely in the fall. Once bermudagrass transitions to true dormancy and turns fully brown, you will need higher colorant rates to achieve the same aesthetic.
Calibrate your sprayer carefully: Considering nozzle selection, spray pressure, spray volume and applying in overlapping passes (ideally in two directions) is critical to avoid streaking and ensure even coverage. It’s worth testing a few different approaches to see what works best before committing on larger areas.
Use consistent reapplication intervals: Many colorants are designed to provide 7-14 days of acceptable color under desert winter conditions, though frequency may have to be adjusted based on traffic, weather and mowing needs.
Choose products carefully: Dyes or pigments are often used while there is still green chlorophyll in the plant, but it is advised to switch to products containing binders (paints) on fully dormant turf for better color. The products with binder will also last longer. Many superintendents apply products with binder at light rates every two to three weeks to provide consistently good color.
Use integrated winter-management practices: When managing dormant turf, it is important to maintain adequate soil moisture with wetting agents, limit traffic as much as possible and rotate access points, and to apply fungicides and fertility as needed to support turf health and facilitate a strong spring greenup.
Limitations: Why Colorants Are Not a Perfect Substitute for Overseeding
Color is cosmetic, not functional: Colorants provide green color but do not create new leaf tissue or enhance wear tolerance. Heavy play and cart traffic on dormant, colorant-coated turf will cause damage and delay spring recovery. The Green Section Record article “The Impacts of Golf Cart Traffic on Dormant Bermudagrass” has valuable information on this subject.
Color longevity is variable: The stability of colorants depends heavily on UV exposure, mowing frequency, rainfall and irrigation, and traffic. Over time, colorants may fade unevenly or shift toward blue-gray tones as their components degrade.
More frequent applications may be required in desert regions: Because desert winters often include intermittent warm spells that allow bermudagrass to produce some growth that requires mowing, colorants may need to be reapplied more often when compared to regions with deep dormancy.
Not ideal for high-wear surfaces: A dense, monochrome stand of dormant warm-season grass affords a great canvas to paint, but applying colorants to thin turf or bare ground will produce unappealing results. The colorant won’t “fix” thin or bare areas.
Facilities should understand that not overseeding greens does not necessarily reduce winter maintenance costs. Instead, the primary benefits are consistent putting quality and a faster, more predictable spring transition when compared to overseeded greens.
Final Thoughts
Colorants are a practical, sustainable and increasingly sophisticated tool for desert golf courses to provide green color during winter. With proper timing, product selection and application technique, non-overseeded greens, fairways and tees can maintain excellent visual quality while preserving water resources and avoiding the challenges of overseeding and subsequent spring transition. As with all golf course maintenance practices, success comes from balancing golfer expectations, environmental conditions and agronomic goals – while remembering that when it comes to winter in the Southwest, green truly is king.
West Region Agronomists:
Brian Whitlark, regional director, West Region – bwhitlark@usga.org
Ross Niewola, agronomist – rniewola@usga.org