Azaleas need pH 5.0–5.5. Even with iron in clay, high pH makes it unavailable. Fertilizers acidify slightly, but process takes years. Fastest: dissolve 8 oz powdered alum (aluminum sulfate) in 1 gal water, pour around azalea—lowers pH by 1 point. If yellow leaves not from pH/iron, this won't help.
Using Lawn Fertilizer (15‑0‑15) in a Vegetable Garden
Fertilizing Houseplants: Skip 10-10-10, Use Specialty Formula
Phosphorus-Free Fertilizers: Why They're Pushed in the Southeast
Soil pH Testing with Litmus Paper: Accurate but Costly
Blueberry Yellow Leaves: Iron Chlorosis from High Soil pH
Debunking the Beer-and-Ammonia Lawn Tonic Myth
Azalea Yellow Leaves: Fertilizer Won't Fix pH Fast—Use Aluminum Sulfate Instead
Evergreen Fertilization: Soil Test First, Then Targeted Feeding
Pelletized Iron on Lawn: Why It's Usually a Waste of Money
Accidentally Used Lawn Fertilizer on Garden Plants? Here's What Happens
Mussel Shells as Garden Amendment: Calcium Source for the Right Soils
Soil Test Interpretation: Fertilizer Program for Northern Ohio Clay Lawn
Balancing Your Compost: Green vs. Brown Materials and Fertilizer Alternatives
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