Southern Ag Aluminum Sulfate Granular Soil Acidifier, 5 LB — Lowers pH for Hydrangeas & Blueberries

Southern Ag Aluminum Sulfate 5 LB is a granular soil amendment designed to lower soil pH and correct excess alkalinity for acid-loving plants like hydrangeas and blueberries.

This formulation contains fertilizer-grade aluminum sulfate (metallic aluminum 9.0%) and is supplied in a convenient 5-pound bag for garden beds and landscape shrubs. It is intended for soil application only (not for foliar spray). Use it to make alkaline soils more suitable for azaleas, camellias, gardenias, rhododendrons, hollies, dogwoods, and other acid-preferring plants. Always follow label directions and safety data sheets for handling and application details.

How quickly will this product change my soil pH?

Soil pH adjustment is gradual and depends on your soil type, current pH, and the amount applied. Aluminum sulfate reacts in the soil to release acidity, which reduces pH over weeks to months rather than instantly.

• Timing varies: corrections usually show over several watering cycles.
• Sandy soils adjust faster than heavy clay soils.
• Retest soil pH after a few weeks to determine if additional applications are needed.

How much should I apply for shrubs, trees, and beds?

Dosage depends on plant size and coverage area; follow recommended rates to avoid over-application. Use the product sparingly and evenly, then water it in and avoid contact with foliage.

• Large shrubs: about 1 lb per 3 feet of shrub height.
• Trees: approximately 1 lb per inch of trunk diameter measured at chest height.
• Small shrubs/beds: roughly 5 lbs per 100 square feet as a general guide.

How do I apply it safely and effectively in my garden?

Apply Aluminum Sulfate only to soil — do not spray. Broadcast the granules evenly around the root zone, avoid direct contact with leaves, and water after application to activate the product.

• Evenly broadcast granular material over the target area.
• Brush or rinse any granules off foliage immediately to prevent leaf damage.
• Water thoroughly after application to move the amendment into the root zone.

What plants benefit most and what should I avoid?

This product is formulated for acid-loving ornamentals and fruiting shrubs; do not use it as a foliar spray or on plants that prefer neutral to alkaline soils. Only use on recommended species and follow label instructions to prevent unintended soil chemistry changes.

• Recommended: hydrangeas, rhododendrons, azaleas, blueberries, holly, camellias, gardenias, dogwoods.
• Not for foliar application; wash any contact from foliage immediately.
• Check soil pH before applying to avoid over-acidification.

Who is this for: Southern Ag Aluminum Sulfate 5 LB is aimed at home gardeners, landscapers, and nursery professionals who need a practical, fertilizer-grade solution to lower pH and correct high soil alkalinity for acid-preferring plants. If you manage ornamental beds or small orchard plots and want to encourage the best growing conditions for hydrangeas, blueberries, rhododendrons, and similar species, this 5-pound package offers a manageable quantity with clear application rates. Always consult the product label and safety data sheet for full instructions and protective measures before use.

Ingredients

Aluminum, Sulfur