PGR Guidelines

This is an easy guide to help you with your plant growth enhancement options, provided by e-GRO – the Electronic Grower Resources Online.

This app lists labeled rates of plant growth regulators (PGRs) for greenhouse grown floriculture crops, as well as recommendations based on research at North Carolina State University, other universities, and recommendations by growers and suppliers. 

Read the label for a complete listing of precautions.  The degree of control can vary greatly depending on a number of factors, including plant type, cultivar, stage of development when the application is made, fertilization program, temperatures, light, and crop spacing.  Therefore when using a PGR for the first time, it’s good to test the rate on a few plants prior to treating the entire crop.  Keep accurate records and adjust the rates for your location. 

Also keep in mind as a general rule, sunbelt growers should consider the upper half of the rate range, while northern growers – especially under low light conditions – should begin trials at the lower end of the rate range. 
Apply all foliar sprays of PGRs using 0.5 gallons of solution per 100 square feet of bench area.  The volume of water applied with drench applications vary with pot size.  Make adjustments accordingly.

The information and listed app rates of PGRS are current as of January 2015.  They are based on label rates, research-based trials from North Carolina State University, other university research, and recommendations by suppliers.  These recommendations may not be appropriate for all conditions and locations and may not comply with laws and regulations in every state.  Individuals who use agricultural chemicals are responsible for ensuring that the intended use complies with current regulations and conforms to the product label.  Be sure to obtain current information about usage regulations and examine a current product label before purchasing or applying any chemical.  The use of brand trade names and any mention or listing of commercial products or services in this publication does not imply endorsement by the author or North Carolina State University, nor discrimination against similar products or services not mentioned.