• Wear chemical-resistant gloves when handling concentrate or mixing solutions
• Wear safety glasses or goggles — avoid eye contact with powder or solution
• When handling dry powder, use a dust mask in enclosed spaces or on windy days
• Wash hands and exposed skin thoroughly with soap and water after handling
• Change and wash contaminated clothing before reuse

• Store in a cool, dry location in the original sealed container
• Keep away from direct sunlight and heat sources — high heat can degrade chelate stability
• Product is hygroscopic (absorbs moisture from air) — reseal tightly after each use
• Keep out of reach of children and pets
• Do not store near food, feed, or drinking water

• Do not apply foliar spray during bloom on crops sensitive to petal burn
• Avoid application when temperatures exceed 90°F — risk of leaf burn increases
• Do not mix with undiluted acids or strong oxidizers
• When tank-mixing, dilute each product separately before combining; check jar test compatibility
• Use caution when mixing with copper-based fungicides — test compatibility first
• Do not exceed recommended rates — manganese toxicity can occur in sensitive crops at very high concentrations

• Eye contact: Immediately flush with clean water for 15 minutes, holding eyelids open. Seek medical attention if irritation persists
• Skin contact: Wash affected area thoroughly with soap and water. Remove contaminated clothing
• Ingestion: Do not induce vomiting. Contact Poison Control (1-800-222-1222) or seek medical attention immediately
• Inhalation: Move to fresh air. If symptoms (coughing, difficulty breathing) persist, seek medical attention

Refer to the Safety Data Sheet (SDS) for complete safety and emergency response information.

Manganese deficiency shows a characteristic interveinal chlorosis pattern — yellowing between leaf veins while the veins themselves remain green. Crucially, this symptom appears first on middle-aged leaves, which distinguishes it from iron deficiency (which affects the youngest leaves). As the deficiency progresses, small gray or tan necrotic spots may develop on the chlorotic tissue. Other indicators include delayed maturity, reduced root development, and increased disease susceptibility. Symptoms are most common when soil pH exceeds 6.8, in organic or high-humus soils, and during cool wet springs when Mn uptake is naturally reduced.

Both cause interveinal chlorosis, but the location of affected leaves is the key diagnostic clue. Manganese deficiency starts on middle-aged leaves and moves upward; iron deficiency starts on the newest, youngest growth and progresses downward. Soil conditions also differ — iron deficiency is most common in calcareous (high-calcium, high-pH) soils, while manganese deficiency occurs in a broader range of high-pH and organic soils. When in doubt, a plant tissue test provides a definitive answer. Optimal tissue Mn: 20–300 ppm; optimal tissue Fe: 50–300 ppm.

The core advantage is pH stability. Manganese sulfate is effective only below approximately pH 5.5, where Mn²⁺ remains soluble. Above this range — which covers most garden soils, turf, and agricultural land — unchelated manganese rapidly oxidizes to insoluble MnO₂ and becomes unavailable to plants. Chelated Mn-EDTA remains plant-available up to pH 7.0 because the EDTA ligand prevents this oxidation reaction. Additional advantages include 3–5x better absorption through roots and leaf surfaces, compatibility with most tank-mix fertilizers and pesticides, and lower required application rates due to greater efficiency. For a deeper look at the differences, see our article on Sulfate vs. Chelated Fertilizers: Key Differences and Garden Benefits Explained.

Yes — chelated manganese EDTA is well-suited for hydroponic use. The stock solution method is recommended: dissolve 1 oz (28g) per gallon of water to create a concentrated stock at approximately 970 ppm Mn, then dilute into your reservoir to reach a target of 0.5–1.0 ppm Mn. This is compatible with most complete hydroponic nutrient programs. Monitor Mn levels weekly with a water test kit, as different crops consume manganese at different rates. Most commercial hydroponic nutrients include some Mn, so always test before adding to avoid oversupply.

Soybeans, wheat, oats, and other small grains are among the most manganese-sensitive field crops. In the vegetable garden, potatoes, onions, sugar beets, peas, and brassicas are frequently affected. Citrus and stone fruit trees commonly show Mn deficiency in alkaline orchard soils. Turf grasses in high-pH or heavily limed soils can also develop interveinal chlorosis. Nursery crops and ornamentals growing in peat-based media with a pH above 6.5 are also prone to deficiency. Commercial growers in high-pH regions often include chelated Mn in preventive micronutrient spray programs.

• Manufactured in California, USA by Greenway Biotech, Inc. — established 1989
• Independently tested for heavy metal content by third-party laboratories
• Registered with the California Department of Food and Agriculture (CDFA)
• Consistent batch-to-batch quality verified through ongoing quality control

If you're not completely satisfied with your results, we offer a 90-day money-back guarantee. Return the unused portion in its original packaging and we'll process a full refund — no hassle. View full return policy →

• Recyclable packaging materials
• Precision micronutrient formulation designed to reduce runoff and over-application
• Support for sustainable and integrated nutrient management practices

1% of all profits support our foundation, focused on expanding educational opportunities for children.