Hydrangea BLUE ensures brilliant blue blooms for your Hydrangea macrophylla: fine-grained aluminum sulfate and pH regulator in one product. By regularly adding aluminum ions and adjusting the soil pH to 4.3–4.7, you can achieve a lasting, intense blue hue.
Ideal for beds, containers, and hanging baskets: Dissolve 2 g per liter of water and water every 4 weeks during the main growing season. Combine with pH test strips to keep soil values consistently low.
