General Information


PROVAIR PGR for turf growth management reduces the frequency of mowing and the amount of grass clippings by reducing the growth of warm- and cool-season turfgrasses. Other benefits, such as increased turf density, increased color, and increased turf quality, are frequently observed after PROVAIR PGR applications.

PROVAIR PGR can be applied to well-maintained, quality turfgrass areas, such as residential and commercial lawns, golf courses, sod farms, sports fields, cemeteries, and similar areas. PROVAIR PGR is useful in the management of difficult-to-mow areas and can be used to minimize the need for edging turfgrass along sidewalks, curbs, parking lots, driveways, flower beds, fences and around posts, storage sheds, and trees.

PROVAIR PGR reaches the growing point by foliar uptake and is rainfast from rainfall or irrigation after one hour. Watering-in is not necessary for activation.

NOTICE TO USER: Plant tolerances to PROVAIR PGR have been found to be acceptable for the grasses listed on the label. Due to the large number of species and cultivars of grasses, it is impossible to test every one for tolerance to PROVAIR PGR. Neither the manufacturer nor the seller has determined whether or not PROVAIR PGR can be used safely on grasses not specified on the label. The professional user should determine if PROVAIR PGR can be used safely prior to commercial use. Before using PROVAIR PGR for grasses not listed in the application table, test PROVAIR PGR on a small scale first. Apply the lower recommended rate for the turf setting (lawn, fairway, etc.) and evaluate for phytotoxicity and growth inhibition prior to widespread use.


Environmental conditions, management, and cultural practices that affect turf growth and vigor will influence the response of the turf to PROVAIR PGR applications. Fertility level, moisture availability, plant vigor, height, and frequency of mowing, etc. have been shown to influence the activity of PROVAIR PGR.

The rates presented in the Application Rate Table provide approximately 50% growth inhibition over a 4-week period with little or no discoloration of turf growing under favorable conditions.

Excessive turf growth, which may occur with high fertilization or during spring flushes, may require higher rates of PROVAIR PGR. Under these conditions, PROVAIR PGR rates may need to be increased up to 50% to provide an adequate length of control.

For extended growth suppression up to 8 weeks, when temporary discoloration can be tolerated, a maximum of twice the recommended PROVAIR PGR rate from the Application Rate Table may be applied.

PROVAIR PGR use rates may need to be reduced up to 50% for turfgrass grown under conditions of low fertility, compaction, or other factors which stress the turf.

Multiple applications of PROVAIR PGR can be made each growing season, but do not exceed a total of 7.0 fl. oz./1,000 sq. ft. (305 fl. oz./A; 19.0 pts./A) per year.


Generally, PROVAIR PGR provides more suppression when turfgrasses are maintained at lower mowing heights than higher mowing heights. Application rates have been selected for typical mowing heights. The application rate may need to be adjusted depending on actual mowing conditions. To minimize possible turf injury, apply PROVAIR PGR then wait at least 4 hours before mowing or mow first, wait at least 1 hour, then apply PROVAIR PGR.

Application Timing

Apply PROVAIR PGR to actively-growing turf. If turf is going into dormancy because of high or low temperatures or lack of moisture, apply a lower rate of PROVAIR PGR.

Repeat applications of PROVAIR PGR may be made as soon as the turf resumes growth or more suppression is desired, but do not apply more than 7.0 fl. oz./1,000 sq. ft. per year.


PROVAIR PGR may be applied with backpack sprayers, hand sprayers, boom sprayers, and with spraygun application devices. Clean spray equipment thoroughly before use. Make sure the sprayer is capable of accurate and uniform application. Calibrate the sprayer before applying PROVAIR PGR. Rinse sprayer with clean water after use and dispose of rinsate in an approved manner.

Turf Pre-Stress Conditioning

Multiple PROVAIR PGR applications along with cultural practices such as fertilization, irrigation, drainage, mowing height, etc., will delay the onset of stress, improve stress survival, and enhance turf’s recovery from stress. Apply PROVAIR PGR to healthy, actively growing turf before the onset of stress and continue to apply PROVAIR PGR throughout the growing season as long as the turf remains healthy, but do not apply more than 7.0 fl. oz./1,000 sq. ft. per year. Turfgrass root-mass is often greater in PROVAIR PGR-treated turf than in similar, untreated turf. As turf top growth slows, energy is redirected to below-ground plant parts, and root and rhizome production increases. Research has demonstrated that PROVAIR PGR may also enhance the performance of fungicides. Monthly applications of PROVAIR PGR at the label rate or biweekly applications at 1/2 the label rate strengthen the turfgrass to help it resist disease. In addition, if mowing is less frequent, and leaf material removal is reduced, contact and systemic products stay at effective concentrations on or in the turf longer. Multiple applications of PROVAIR PGR will reduce water use and improve drought tolerance. PROVAIR PGR applications result in smaller, more compact turfgrass and leaf area is reduced for transpiration. Increased turf density reduces moisture loss from soil evaporation, and additional soil moisture is available due to increased root depth and mass. PROVAIR PGR also may increase carbohydrate levels which have been shown to enhance heat and cold tolerance.


PROVAIR PGR can be applied to existing turf infested with stands of Poa annua as part of an overseeding/renovation program. Such an application allows better germination and seedling growth of more desirable turf. The use of PROVAIR PGR, with appropriate cultural practices, that help to ensure the vigor and growth of new seedlings, will also result in fewer clippings and thus reduce maintenance traffic on new seedlings. Because PROVAIR PGR is foliarly absorbed, seed germination is not affected. Apply PROVAIR PGR 1– 5 days before seeding; and before verticutting, scalping, spiking, or other similar operations.

Temporary initial discoloration is possible with aggressive application rates of PROVAIR PGR to turf with Poa annua. The following spring, apply the upper end rate of PROVAIR PGR for the turf type and setting listed in the Application Rate Table. Actual conversion success will also depend on growing conditions, fertilization, rainfall, and other agronomic and environmental conditions.


An application of PROVAIR PGR to bermudagrass will enhance the establishment of cool-season turfgrasses. Application of PROVAIR PGR, along with cultural practices that help ensure new seedling vigor and growth, will also result in fewer clippings and less maintenance traffic on new seedlings. PROVAIR PGR is foliarly absorbed, so germination and seedling growth is not affected.

Apply PROVAIR PGR before verticutting, scalping, spiking, or other similar operations to the bermudagrass. Apply PROVAIR PGR 1– 5 days before seeding.

Temporary initial discoloration of turfgrass is possible with aggressive application rates of PROVAIR PGR. Use normal seeding rates for your area and turf setting (lawn, fairway, etc.). Actual overseeding success will also depend on growing conditions, fertilization, rainfall, and other agronomic and environmental conditions. For maintenance applications, see the Application Rate Table.

Limitations, Restrictions, and Exceptions


PROVAIR PGR can extend the duration of marking visibility when applied before or with marking agents. Mix PROVAIR PGR with water first when combining with latex-based marking agents. Refer to the marking agent’s product label for further instructions.

Apply PROVAIR PGR at 1 oz./gal. of marking paint mix to treat approximately 1,000 sq. ft. of line surface area. Refer to the PROVAIR PGR + Tank Mixtures section of the label for additional instructions.