Winter Applications of Plant Growth Regulators Improve Annual Bluegrass Seedhead Suppression Adam Van Dyke, CPAg, MS, Professional Turfgrass Solutions, LLC Author email: adam@proturfgrasssolutions.com The use of chemical plant growth regulators (PGRs) in spring is common on golf courses where annual bluegrass (Poa annua) inflorescences (flowers/seedheads) are undesirable. Seedheads negatively impact surface uniformity and […]