FAIRLESS HILLS, Pa., Aug. 03, 2021 (GLOBE NEWSWIRE) -- Hydrofarm Holdings Group, Inc. (“Hydrofarm” or the “Company”) (Nasdaq: HYFM), a leading distributor and manufacturer of hydroponics equipment and supplies for controlled environment agriculture (“CEA”), today announced that it has signed a definitive agreement and closed on the acquisition of Canadian nutrient company, Greenstar Plant Products, Inc. (“Greenstar”), manufacturer of the Grotek and Gaia Green brands.