• Wear chemical-resistant gloves when measuring or mixing
• Wear safety glasses or goggles — fine powder can irritate eyes
• Use a dust mask or respirator in poorly ventilated areas to avoid inhaling fine particles
• Wash hands and exposed skin thoroughly with soap and water after handling

• Store in a cool, dry location in the original sealed container
• Keep away from direct sunlight and sources of heat
• This product is hygroscopic — reseal tightly after every use to prevent moisture absorption and caking
• Keep out of reach of children and pets
• Do not store near food, feed, or potable water sources

• Do not exceed recommended application rates — zinc is toxic to plants at elevated levels
• Avoid application during bloom in tree crops; zinc can interfere with pollination
• Test soil or reservoir before applying to avoid compounding existing zinc levels
• In hydroponics, always use the stock solution method — direct addition risks acute overdose
• Avoid contact with clothing — chelated zinc can stain fabric
• Do not mix with highly alkaline pesticides without a compatibility test

• Eye contact: Flush immediately with clean water for at least 15 minutes. Seek medical attention if irritation or redness persists.
• Skin contact: Wash affected area thoroughly with soap and water. Remove contaminated clothing.
• Ingestion: Do not induce vomiting. Contact Poison Control at 1-800-222-1222 or seek medical attention immediately.
• Inhalation: Move to fresh air. Seek medical attention if coughing, shortness of breath, or other symptoms persist.

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

Zinc deficiency always appears on new growth first because zinc is immobile in plants — it cannot move from older leaves to support emerging tissue. Key symptoms include interveinal chlorosis (yellowing between leaf veins on young leaves), small and narrow "little leaf" in trees, shortened internodes creating a rosette or clustered appearance, bronze or necrotic spots (especially in beans), white bud in corn (young leaves emerge pale or white), and delayed maturity with poor fruit or seed set. Deficiency is most common in soils above pH 7.0, sandy soils, high-phosphorus soils, and during cool, wet growing conditions. For a detailed visual guide, see our article on Understanding Zinc Deficiency in Plants.

Chelated zinc EDTA and zinc sulfate differ primarily in how they behave in soil. Zinc sulfate is inexpensive but precipitates out of solution above pH 5.5, binding with phosphates and carbonates to form insoluble compounds unavailable to plants. Chelated zinc EDTA remains soluble and plant-available through pH 7.0, making it 5–10× more efficient per pound in alkaline and calcareous soils. Chelated zinc also causes less phytotoxicity in foliar applications and is compatible with most fertilizer programs. In acidic soils below pH 5.5, zinc sulfate is often sufficient and more economical. For a full comparison, see Sulfate vs. Chelated Fertilizers: Key Differences Explained.

Yes, but always use the stock solution method — never add the powder directly to a reservoir. The amounts needed are extremely small (often under 1 gram for a typical system), so direct addition makes it nearly impossible to avoid overdose. To make a stock solution, dissolve ½ cup (approximately 108 g) in 1 gallon of water to create a ~4,000 ppm zinc concentrate. Add 1–3 teaspoons of this stock per 100 gallons of reservoir and test with a ppm meter to confirm the final concentration is 0.05–0.2 ppm zinc. Never exceed 0.5 ppm — zinc toxicity causes bronze leaf discoloration and significant root damage.

For annual crops, apply zinc at or before planting — band application near the seed row is the most efficient method. For perennial trees and vines, apply in early spring before bud break. For corrective applications once symptoms appear, foliar spray provides the fastest response because zinc is absorbed directly through the leaves. Soil applications take longer to reach deficient tissues. A single application lasts the full growing season for most annual crops; perennials may benefit from annual soil applications or foliar sprays during active growth.

Yes — zinc is beneficial at the right levels but toxic at elevated concentrations, particularly in sensitive crops like beans, spinach, and hydroponic systems. Always soil test before applying (critical level is 0.5–1.0 ppm DTPA-extractable Zn), and follow the application rates on this page. In hydroponics, maintain zinc below 0.5 ppm and start at the lower end of the range. Tissue testing is the most accurate way to monitor plant zinc levels — the optimal range for most crops is 20–60 ppm in leaf tissue. For broader micronutrient management principles, see our Essential Micronutrient Management Guide.

Corn is the highest-risk crop for zinc deficiency and often shows white bud symptoms in young plants. Citrus, pecans, grapes, beans, rice, and sorghum are also highly susceptible. Deficiency risk increases on sandy soils, soils with pH above 7.0, soils recently limed or with high available phosphorus, and in cold, wet conditions that reduce root activity. Areas recently cleared of organic matter (such as graded subsoil) are also prone to zinc deficiency because topsoil zinc is lost in grading.

• Manufactured in California, USA by Greenway Biotech, Inc.
• Independently lab tested for heavy metal content
• Registered with the California Department of Food and Agriculture (CDFA)
• Consistent 14% chelated zinc concentration verified by quality control testing

Not satisfied? We offer a 90-day money-back guarantee. Return the unused portion in its original packaging for a full refund — no questions asked.

• Precision micronutrient formulation reduces over-application and runoff
• Lower application rates versus non-chelated forms mean less product per treated acre
• Support for sustainable precision agriculture practices

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