Color Me Blue™ from Bonide® sweetens, or acidifies, the soil to the right pH (5.0-5.8) for blue-flowering Bigleaf Hydrangeas to stay true blue instead of purple. Work 3 scoops of Color Me Blue™ per plant into the backfill soil for new plantings. For existing plantings, apply in spring, working 6 scoops (1/2 cup) into the soil around the root zone while staying away from the plant stem. Water well after applying.
Each 2.75 lb. container of Color Me Blue™ contains 90% Sulfur (dry weight). Measuring scoop and instructions for use included.