• Wear gloves and eye protection when handling
• Avoid inhaling dust — use a dust mask in enclosed or poorly ventilated areas
• Wash hands thoroughly after handling

• Store in a cool, dry place in the original sealed container
• Keep out of direct sunlight and away from heat sources
• Zinc sulfate is hygroscopic — reseal tightly after each use to prevent clumping
• Keep out of reach of children and pets

• Do not apply foliar sprays to water-stressed plants or during extreme heat
• When using as herbicide, avoid contact with desired plants and lawn grasses
• For moss control, protect nearby vegetation from spray drift and runoff
• Do not mix with phosphorus fertilizers — zinc phosphate is insoluble and locks up both nutrients
• Test moss control solution on a small area first to check for surface staining

• Eye contact: Flush with clean water for 15 minutes. Seek medical attention if irritation persists
• Skin contact: Wash affected area with soap and water
• Ingestion: Do not induce vomiting. Contact Poison Control (1-800-222-1222) or seek medical attention
• Inhalation: Move to fresh air. Seek medical attention if symptoms persist

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

Zinc sulfate is an essential micronutrient fertilizer containing 35.5% zinc and 16.5% sulfur. Zinc is crucial for plant enzyme systems, protein synthesis, and growth hormone production. Without adequate zinc, plants develop interveinal chlorosis (yellowing between leaf veins), stunted growth, and reduced yields.

According to the WHO, roughly a third of the world's population is affected by zinc deficiency, making zinc-enriched crops important for human nutrition. Plants absorb zinc from the soil and concentrate it in their edible parts, providing a natural way to address dietary zinc deficiency. For a deeper dive into zinc's role in plant health, see our article on What's the Function of Zinc (Zn) in Plants?

Zinc deficiency symptoms vary by plant but commonly include:

• Interveinal chlorosis (yellowing between leaf veins while veins remain green)
• Stunted growth and shortened internodes creating a "rosette" appearance
• Small, narrow, or malformed leaves
• Delayed maturity and poor fruit set
• In pecans: small leaflets, wavy margins, and "mouse ear" symptoms
• In corn: white or yellow stripes on leaves

Zinc deficiency is most common in alkaline soils (pH above 7.0), sandy soils, or soils high in phosphorus. Soil tests showing less than 1.0 ppm available zinc typically indicate deficiency. For a complete guide to spotting all micronutrient issues, read Identifying Micronutrient Deficiencies in Plants.

Yes, zinc sulfate is an effective natural alternative for moss control and weed management. For moss on roofs and structures, mix 3 ounces per gallon of water and spray evenly. The zinc ions disrupt moss cell structure, causing it to die and detach within 7-14 days.

As a herbicide, use 4-6 ounces per gallon for broadleaf weeds or 6-8 ounces for grasses. Apply on sunny days for best results. Unlike chemical herbicides, zinc sulfate breaks down naturally and won't harm the ecosystem. Always test on a small area first and avoid runoff to desired plants. For more natural weed management strategies, see our guide on How to Masterfully Manage Weeds in the Garden.

Pecan trees have high zinc requirements and benefit from regular applications. For foliar application, mix 2-3 pounds of zinc sulfate per 100 gallons of water (or 2-3 tablespoons per gallon). For best results, add ¼ tablespoon of urea per gallon to improve zinc absorption.

Apply to young leaves early in the season when leaves are ⅓ to ⅔ fully expanded. Focus on lower leaf surfaces where absorption is highest. For mature trees, apply 1-2 pounds of zinc sulfate per tree as a soil application in early spring, working it into the soil around the drip line.

Yes, our zinc sulfate is independently lab tested for heavy metal content, making it safe for use on all edible crops. Zinc is actually an essential nutrient for human health, and using zinc sulfate on food crops can help increase the nutritional value of your harvest.

Always follow recommended application rates and allow appropriate time between application and harvest as specified on the label.

The key difference is zinc concentration. Monohydrate (ZnSO₄·H₂O) contains 35.5% zinc, while heptahydrate (ZnSO₄·7H₂O) contains only 23% zinc. This means monohydrate delivers about 54% more zinc per pound, so you need less product per application. Monohydrate also stores better because it absorbs less atmospheric moisture than heptahydrate.

• Sourced from premium Canadian manufacturers with rigorous quality control
• Tested by independent third-party laboratories for purity
• Registered with the California Department of Food and Agriculture (CDFA)
• Independently lab tested to verify products meet strict heavy metal standards
• Consistent 35.5% zinc content in every batch

If you're not completely satisfied, we offer a 90-day money-back guarantee. Simply return the unused portion in its original packaging, and we'll process a full refund. No questions asked.

• Recyclable packaging materials
• Precise nutrient formulation to reduce environmental runoff
• Support for integrated pest management (IPM) practices
• Promoting natural alternatives to synthetic chemicals

1% of all profits go to our foundation, focused on improving educational opportunities for children in agricultural communities.