Exhibit 99.1 Hydrofarm Holdings Group Announces Second Quarter 2025 Results Shoemakersville, PA — August 12, 2025 — Hydrofarm Holdings Group, Inc. ("Hydrofarm" or the "Company") (Nasdaq: HYFM), a leading independent manufacturer and distributor of branded hydroponics equipment and supplies for controlled environment agriculture, today announced financial results for its second quarter ended June 30, 2025. Second Quarter Highlights vs. Prior Year Period: (1) Adjusted Gross Profit, Adjusted Gross Profit Margi ...