Acid Mix 4-3-6 (5 lb Box)

Fertilizer for Blueberries, Azaleas, and Other Acid-Loving Plants

Down To Earth Acid Mix 4-3-6 is formulated for plants that grow best in acidic soil, including blueberries, raspberries, rhododendrons, azaleas, hydrangeas, evergreen trees, and many ornamental shrubs. The 5 lb box is a versatile choice for home gardens with several plants or repeated seasonal applications.

The 4-3-6 analysis provides primary nutrients, while calcium, magnesium, sulfur, and humic acids add useful secondary components. This granular fertilizer can be mixed into soil for new plantings or applied around established plants.

Key Features

• Formulated for berries, acid-loving flowering shrubs, and evergreen trees and shrubs.
• Granular form is suitable for soil incorporation, side-dressing, and application beneath the drip line.
• Supplies a 4-3-6 NPK analysis plus 3% calcium, 2% magnesium, and 2% sulfur.
• Contains 2.5% humic acids derived from Leonardite.
• Made from cottonseed meal, fish bone meal, langbeinite, rock phosphate, and seaweed meal.

Guaranteed Analysis

• Total nitrogen: 4%
• Available phosphate: 3%
• Soluble potash: 6%
• Calcium: 3%
• Magnesium: 2%
• Sulfur: 2%

Application Guidance

New berry beds: Apply 2.5–5 lb per 100 linear feet and mix thoroughly into the top 3 inches of soil. For new berry plants one to two years old, mix approximately 1/2 cup with the backfill soil, fill around the plant, and water well.

Established berries: Apply approximately 1 cup per plant in early spring, mix it into the soil surface, and water thoroughly. Repeat when blooms appear. When using a fall application, use approximately half the normal rate.

Trees and shrubs: For established plants, spread approximately 1 lb per inch of trunk diameter from the base toward the drip line, mix lightly into the soil surface, and water well. For new trees and shrubs, mix 1–2 cups with the backfill soil before watering.

Application rates can vary by plant size and local soil conditions. Follow the current product label and use a soil test when possible.

Choose Your Package Size

Select the 1 lb box for containers and small plantings, this 5 lb box for typical home-garden use, or the 25 lb bag for larger berry rows and landscapes.

Shop more options in our acid-loving fertilizer collection or natural and organic fertilizer collection.