The Right Way to Fertilize Hydrangeas for Huge Blooms August 7, 2025 by Admin Most common: Balanced 10-10-10 slow-release fertilizer If blooms are weak: Try 10-20-10 for a phosphorus boost Don’t overdo it—too much = lush leaves, no blooms ⏰ 4. Fertilize at the Right Time SEE NEXT PAGE ←PreviousNext→