ICL Blue-Max Coated Alum Sulfate 50Lb (40/Pl)

Specially formulated for use in the production of blue variety Hydrangeas. Blue-Max shines in helping maintain the growing media pH in an acceptable range for the plant to take up Aluminum and store it in the buds. Providing a steady supply of Aluminum and aiding in keeping the root zone at the proper pH is exactly what is needed to produce blue flowers. OMRI listed®.