Feb 09, 2026 8:00 AM
Training Video: Understanding PGR
First takeaway Josh presents is that accurate drench volume is critical, especially in your larger container sizes. A common rule of thumb, such as applying 1 fl. oz. per inch of pot diameter, may work for smaller pots but becomes inaccurate as container sizes increase.
Larger pots have exponentially greater substrate volume and require substantially more drench solution. For example, a 12-inch container may need 20 to 25 fl. oz. of solution to achieve proper application. Applying too little can reduce effectiveness, while over-applying can lead to excessive growth control. Growers should calculate drench volumes based on container volume rather than relying solely on pot diameter.
Next, Josh suggests following proven recommendations from the product cultural team and perform a test before widespread PGR use. Before making a PGR drench application, growers should consult trusted resources such as the GrowerTalks magazine PGR Guides, breeder cultural recommendations, and product labels to determine appropriate products and rates for specific crops and varieties.
Tools like the e-GRO PGR MixMaster app can help ensure accurate mixing. When using a new PGR, applying a drench to a small trial group first is a smart risk-management strategy that helps avoid potentially damaging an entire crop if the rate or timing is not ideal.
And finally, Josh reminds growers that proper application timing and consistency can help maximize results. Successful PGR drenches require good preparation and uniform application. Crops should be thoroughly watered the evening before treatment, so plants are not under drought stress, with substrate moisture ideally at a moderate level. Morning applications are preferred because environmental stress is typically lower.
During application, every pot should receive the same drench volume, whether using a hose or drip irrigation system. After treatment, avoid excessive irrigation or leaching within the next 24 hours, as this can wash PGRs from the root zone and reduce their effectiveness. Consistent application practices are key to achieving uniform growth control across the crop.
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