Jobe's® Organic Soil Acidifier

If your blueberry leaves are turning yellow when they should be deep green, the most likely cause is soil pH that’s too high. Blueberries need acidic soil — pH 4.5 to 5.5 — to absorb the nutrients that keep their foliage healthy and their production vigorous. When the soil is too alkaline, nutrients become chemically unavailable no matter how much you fertilize, and the plants respond with the telltale yellowing that signals the problem. Jobe’s® Organic Soil Acidifier corrects that imbalance with elemental sulfur and gypsum — lowering soil pH gradually and durably to the range where blueberries, azaleas, rhododendrons, and hydrangeas thrive. OMRI-listed. Apply every 8 weeks as needed.

Always test soil pH before applying — over-acidification can damage plants as much as alkalinity.

Yellow Blueberry Leaves? It’s Probably Soil pH

Yellowing leaves on blueberry bushes — particularly when the veins remain green while the tissue between them yellows — is a classic sign of iron chlorosis caused by soil that’s too alkaline. Blueberries are one of the most pH-sensitive fruits grown in home gardens, and even slightly alkaline conditions can lock out iron and other micronutrients regardless of fertilization. Correcting soil pH is the foundational fix that makes everything else work.

Elemental Sulfur and Gypsum — Lasting pH Reduction

Jobe’s® Organic Soil Acidifier works through elemental sulfur — which soil bacteria convert into sulfuric acid over time, gradually and durably lowering soil pH — combined with gypsum for improved soil structure and calcium availability. The result is a more lasting pH correction than short-term acidifying fertilizers provide, building toward the target pH range over successive applications rather than spiking temporarily.

OMRI-Listed — For Blueberries, Azaleas, Rhododendrons, and Hydrangeas

The OMRI-listed formulation is certified for use in organic growing programs — important for edible fruit plants like blueberries where organic certification matters. The same product that corrects blueberry soil also benefits acid-loving ornamentals including azaleas, rhododendrons, and hydrangeas, making it a versatile single product for any garden with acid-soil plants.

Why Growers Choose Jobe’s® Organic Soil Acidifier

• Corrects yellowing blueberry leaves — the diagnostic solution for alkaline soil
• Elemental sulfur and gypsum — lasting pH reduction through biological soil conversion
• OMRI-listed — certified for organic growing programs
• Works for blueberries, azaleas, rhododendrons, and hydrangeas — broad acid-soil plant coverage
• Apply every 8 weeks as needed — gradual, controlled pH correction
• Test soil pH before applying — ensures accurate, targeted application