Blue Max Coated Aluminum Sulfate | 50lb (40/PL)

Coated Aluminum Sulfate for Blue Hydrangea Color, 50lb

Blue hydrangea coloration depends on the plant taking up and storing aluminum in its buds, which only happens reliably when growing media pH sits in a specific acceptable range. Blue Max Coated Aluminum Sulfate is specially formulated for use in the production of blue variety hydrangeas, helping maintain that pH range while supplying a steady source of aluminum.

Sold as a 50lb bag, 40 per pallet, E-Max Release coating.

Key Features & Benefits

• Specially formulated for blue hydrangea production — the product's specific, named use case.
• Helps maintain growing media pH — in the range needed for aluminum uptake and storage in buds.
• Provides a steady supply of aluminum — aiding root-zone pH control needed to produce blue flowers.
• E-Max Release coating technology — for controlled, consistent aluminum sulfate delivery.

Who Should Use Blue Max Coated Aluminum Sulfate

This fits hydrangea growers specifically producing blue-variety plants who need to maintain an acidic root-zone pH and supply steady aluminum for bud coloration.

About Blue Max

Blue Max is manufactured by ICL Growing Solutions as part of the Osmocote Special Products line, using E-Max Release coating technology to deliver aluminum sulfate for blue hydrangea color production.

Frequently Asked Questions

How and when should Blue Max be applied?

Incorporate it into the growing media during production of blue-variety hydrangeas, since it's formulated to work over the crop's growing cycle rather than as a one-time correction. Its E-Max Release coating is designed for steady, controlled delivery through that cycle rather than an immediate pH shift.

Why does growing media pH matter for hydrangea color?

Blue coloration depends on the plant taking up and storing aluminum in its buds, which happens reliably only when growing media pH sits in an acceptable acidic range. Blue Max is formulated specifically to help maintain that pH range alongside supplying the aluminum itself.

What plants is this product intended for?

It's specially formulated for use in the production of blue variety hydrangeas specifically, not as a general-purpose micronutrient or acidifying product. That narrow focus is what distinguishes it from broader-spectrum fertilizers in the Osmocote Special Products line.

What does E-Max Release coating do?

It's ICL's polymer coating technology applied to the aluminum sulfate core, delivering the aluminum in a controlled, steady release rather than all at once. That steady supply is what supports consistent bud coloration over the growing season.

What size and packaging is this listing?

It ships as a 50lb bag, 40 per pallet, sized for commercial hydrangea production. That volume suits growers producing blue-variety hydrangeas at nursery or greenhouse scale.