Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer, manufactured by ICL Specialty Fertilizer, is a professional fertilizer specifically made to enhance the bloomage and production of commercially grown hydrangeas.

Featuring a unique and modern polymer-coated E-Max Release Technology, which works by releasing nutrients into the soil based on soil moisture and temperature, offering a sustained supply of nutrients in safe and long-term manner.

Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer contains effective ingredients that helps to eliminate consistent applications and safely lower phytotoxicity risk than drenches for increased blue color of hydrangea flowers.

Tools Needed

To apply Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer, you will need a handheld spreader.

How to Use

• Step 1: Determine how much Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer to use by measuring the cubic yard of the treatment area. To do this, measure the length, width, and depth of the treatment area in feet then multiply them together and then divide the total by 27 (length X width X depth = total / 27 = cubic yard). Depending on the plant container sizes and how many there are in the treatment area will vary in application rates so it would be best to refer to the product label. For 300 containers measuring about trade 1 gallon, use either 12 or 18 grams of Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer per cubic yard. To treat about 35 containers measuring about 7 gallons, apply either 104 or 156 grams of product per cubic yard.
• Step 2: Adjust the rate of application on handheld spreader to deliver the proper ratio. Load the measured amount of Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer into the spreader.
• Step 3: Broadcast the Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer uniformly over soil surface, making sure that product does not pile up against leaves and stems. Water in immediately after application.

Where to Use

Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer can only be applied to the soil surface of outdoor blue hydrangea flowers.

Avoid applications to stems and leaves.

When to Use

Apply Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer in the spring as soon as plants break dormancy or during any period of flower development.

Safety Information

Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer is safe to use around children and pets when applied according to the product label instructions. Always wear the proper personal protective equipment (PPE) when applying this product.

Special Considerations

Use lower application of Osmocote Blue-Max Aluminum Sulphate (2-3M) Fertilizer rates for: freshly potted or young plants, greenhouse production, high peat based media, lower root zone pH’s (< 6.0), low P fertilizer program, sub-irrigation, crops also receiving other Al treatments.

Depending on the average media temperature of hydrangeas the residual rate will vary. For example:

60 degrees Fahrenheit will not require another application until 3-4 months have passed.

70 degrees Fahrenheit will last up to 2-3 months.

80 degrees Fahrenheit will last up to 1-2 months.

90 degrees Fahrenheit will last up to 0.5-1.5 months.