The purpose of this study was to evaluate the efficacy of an experimental plant growth regulator (PGR) against the industry standard PGR. The reduction in biomass growth and crop tolerance were measured in Kentucky bluegrass in a sod mixture. Data were also collected to find the appropriate amount of experimental PGR to be added to plants to ensure optimum crop safety for turf. Five groups of experimental PGR were used with different rates, along with 1 control group. The general vigour and plant colour were measured throughout the experiment. The results saw that there was no significant difference in NDVI after the trial, whereas in previous trials a positive correlation was observed. All the trials had either a neutral or positive effect on the plant colour.