Rightline Prohex 27.5 WDG

PROHEX 27.5 WDG Plant Growth Regulator

Keep your turf tighter, denser, and easier to manage with PROHEX 27.5 WDG, a water-dispersible granule formulation built around prohexadione calcium, a gibberellin inhibitor that slows unwanted vertical growth in cool- and warm-season grasses. It’s suited for use across the whole course — greens, tees, fairways, roughs, and other turf areas.

As a late-stage growth inhibitor, PROHEX works by limiting the plant’s own growth hormone pathway rather than simply clipping growth after the fact, which translates into noticeably better turf density, quality, and overall appearance. Superintendents can expect visible growth suppression within about three days of application, along with fewer clippings and reduced mowing frequency — freeing up crew time for other course maintenance priorities. It’s also an effective tool for managing Poa annua, helping it grow more favorably alongside other turf species in mixed stands.

For scheduling flexibility, applications can be timed either by a standard calendar interval or by tracking Growing Degree Days (GDD), letting turf managers tailor treatments to actual growing conditions rather than a fixed clock. The product becomes rainfast just one hour after application, reducing the risk of a wasted treatment from unexpected weather. It ships in a resealable 6 lb package for easier storage and handling, and carries a Caution signal word.