Aluminum Sulfate Granular 50Lb (40/PL)

Aluminum Sulfate is a highly effective soil amendment used to lower soil pH and provide additional aluminum for plants that thrive in acidic conditions. This granular product is particularly popular for transforming the blooms of Hydrangea macrophylla from pink to beautiful shades of blue, creating a stunning visual effect in the garden. 

Additionally, it supports the growth of acid-loving plants like blueberries, azaleas, and rhododendrons by improving nutrient availability in acidic soils.

Key Features

Aluminum Sulfate Granular is a powerful tool for gardeners looking to adjust soil pH and enhance plant health. Its easy-to-apply granular form is ideal for a variety of acid-loving plants, offering both functional and aesthetic benefits. Here are the key features that make Aluminum Sulfate Granular a valuable addition to your gardening supplies:

• pH Adjustment: Lower soil pH, making it more acidic for plants that prefer acidic growing conditions.
• Hydrangea Color Control: Provides aluminum to Hydrangea macrophylla, turning pink blooms to vibrant blue hues.
• Granular Formulation: Easy to spread and mix into the soil for even application.
• Multi-Purpose: Suitable for various acid-loving plants like blueberries, azaleas, rhododendrons, and camellias.
• High Efficiency: A 50-lb bag ensures wide coverage and multiple applications for gardens, landscapes, or nurseries.

Why Use Aluminum Sulfate?

There are certain reasons why using Aluminum Sulfate is advantageous:

Lower Soil pH

Many plants thrive in acidic soil (pH 5.0–6.5). Aluminum sulfate effectively reduces soil pH, allowing acid-loving plants to absorb essential nutrients like iron and phosphorus more efficiently.

Transform Hydrangea Blooms

The color of Hydrangea macrophylla blooms is influenced by soil pH and aluminum availability:

• Acidic Soil (pH 4.5–5.5): Blue flowers appear due to increased aluminum uptake.
• Neutral/Alkaline Soil (pH 6.0+): Flowers remain pink as aluminum is less available.

By adding aluminum sulfate, you can manipulate soil conditions to create the vibrant blue flowers many gardeners desire.

Improved Nutrient Uptake

Acidic soils allow plants to absorb nutrients more effectively. Aluminum sulfate helps unlock essential minerals like iron, manganese, and zinc, which may be unavailable in neutral or alkaline soils.

How to Use Aluminum Sulfate

For Lowering Soil pH

• Soil Test: Before application, perform a soil test to determine the current pH. The ideal pH for most acid-loving plants is between 4.5 and 6.0.
• Application Rate:
• For existing plants, apply 1/2 pound per 10 square feet of soil.
• For new beds, mix 1 pound per 10 square feet into the top 6 inches of soil.
• Application Method:
• Spread evenly across the soil surface.
• Water thoroughly to help dissolve the aluminum sulfate and allow it to penetrate the soil.
• Recheck pH: Retest soil pH after 4–6 weeks and reapply as needed.

For Hydrangea Bloom Color

• To achieve blue blooms: Apply aluminum sulfate early in the growing season before flowering begins.
• Rate: Mix 1 tablespoon per gallon of water and apply to the soil around the base of the hydrangea every 2–4 weeks during the growing season. Avoid applying directly to the plant foliage.

For Acid-Loving Plants

• Apply 1/2 pound per 10 square feet of soil around blueberries, azaleas, rhododendrons, or other acid-loving plants.
• Water the area well after application to ensure proper absorption into the soil.

Safety and Handling

• Avoid Overapplication: Excess aluminum sulfate can harm plants. Always test the soil before applying.
• Protective Measures: Use gloves and avoid inhaling dust during application.
• Keep Away from Roots: Direct contact with concentrated aluminum sulfate can damage roots. Water immediately after application.

Benefits of Aluminum Sulfate

Let’s check some of the most important benefits of Aluminum Sulfate:

• Improved Soil Health: Optimizes pH for acid-loving plants, improving overall growth and productivity.
• Customizable Hydrangea Blooms: Control flower color with precision for stunning blue blossoms.
• Versatile Use: Suitable for gardens, landscapes, nurseries, and potted plants.
• Large Coverage: A 50-lb bag covers a significant area, providing excellent value for gardeners and landscapers.