• Wear gloves and eye protection when handling powder
• Avoid inhaling dust — use in well-ventilated areas or wear a dust mask
• 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
• This product is hygroscopic — it absorbs moisture from the air. Keep sealed tightly between uses
• If powder clumps, break it up before use — clumping does not affect efficacy
• Keep away from children and pets

• In hydroponic systems, always add Cal-Mag Plus first, then 11-11-40 fertilizer
• Use separate stock tanks for calcium fertilizers and other concentrated fertilizer salts; always dilute each independently before combining in the main tank
• Avoid direct contact between concentrated fertilizer and plant stems or foliage
• Apply foliar sprays in early morning or late evening to minimize leaf burn risk
• Do not exceed recommended application rates — over-fertilization can cause nutrient burn
• Flush hydroponic reservoirs and container soils periodically to prevent salt accumulation

• 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.

Research shows that when potassium needs are fully met, this nutrient supports the nutrient balance associated with capsaicin development — helping peppers reach their heat potential under proper growing conditions. For best results, apply consistently through fruit development and harvest when fully ripe. To learn more about how potassium supports plant quality, see our article on What's the Function of Potassium (K) in Plants?

To bring out the best flavor and aroma in culinary herbs: reduce watering slightly 1–2 days before harvest (without wilting), harvest in early morning after dew dries, apply extra 11-11-40 during flowering, and provide slightly cooler nighttime temperatures. Consistent potassium feeding helps support the natural flavor compounds that make herbs like basil, oregano, and thyme more potent at harvest. For a deep dive on choosing the right fertilizer for your herb garden, see Best Fertilizer for Pepper & Herb.

Yes, herbs like basil and cilantro benefit from extra nitrogen during vegetative growth. For hydroponics, add 1–2 tablespoons of Calcium Nitrate per 100 gallons for both nitrogen and calcium. For soil, supplement with fish emulsion or blood meal every 2–3 weeks during active growth. For more on nitrogen's role, see What's the Function of Nitrogen (N) in Plants?

pH requirements vary between peppers and herbs. Peppers prefer pH 5.8–6.2 during blooming and 6.2–6.5 during vegetative growth. Most culinary herbs generally prefer pH 6.2–6.8, with slightly higher values acceptable for many species. Always check pH after mixing nutrients and adjust before feeding.

For fruiting peppers, a high-potash formula like 11-11-40 is well suited from the flowering stage through harvest. Potassium demand peaks during fruit development, and a potash-forward ratio helps support fruit quality, color, and overall performance. During early vegetative growth, a more balanced formula with higher nitrogen can help establish strong foliage first. See What's the Function of Potassium (K) in Plants? for more background.

It depends on the growth stage. During vegetative growth, nitrogen drives leaf development and overall plant size. Once flowering begins and through fruiting, potassium becomes the dominant demand — it supports fruit set, quality, and heat potential in hot peppers. This 11-11-40 formula is designed specifically for that fruiting window, with balanced nitrogen and phosphate to maintain healthy plants and high soluble potash (40% K₂O) to support fruit development. For guidance on selecting the right pepper fertilizer at each stage, see Best Fertilizer for Peppers.

Yes — this formula works well for most culinary herbs, particularly aromatic varieties like basil, oregano, thyme, rosemary, and sage where flavor and aroma intensity at harvest matters. Use the herb rates (1.5g per plant or 0.7–1.15 lbs per 100 sq ft) rather than pepper rates, as herbs generally have lower overall nutrient demand. For leafy herbs like cilantro and parsley that need more nitrogen push during vegetative growth, supplement with 1–2 tablespoons of Calcium Nitrate per 100 gallons in hydroponic systems or use a fish emulsion in soil.

Both are high-potash formulas designed for fruiting crops, but they differ in their N-P balance. Our Tomato Fertilizer 4-18-38 has much higher phosphate (18% P₂O₅) and lower nitrogen (4%), making it better suited for heavy phosphorus feeders like tomatoes during flowering and fruit set. This 11-11-40 formula has equal nitrogen and phosphate with even higher potash, making it better suited for peppers — which need more sustained nitrogen through fruiting — and for aromatic herbs where high potash supports flavor and aroma intensity.

Calcium and phosphate are chemically incompatible in concentrated solution — when mixed, they form insoluble calcium phosphate that becomes unavailable to plants. Since our formula contains 11% available phosphate (P₂O₅), calcium must be applied separately. Use Cal-Mag Plus 2-0-0 or Calcium Nitrate 15.5-0-0 as a separate addition — always add it to the reservoir first, before the 11-11-40, and use separate stock tanks for concentrated solutions.

This fertilizer is hygroscopic — it absorbs moisture from the air. Keep the bag sealed tight between uses and store in a cool, dry place out of direct sunlight. If the powder clumps, simply break it up before use. Clumping does not affect efficacy or nutrient content.

Yes. The balanced nitrogen and phosphate with high soluble potash supports color development, bloom duration, and overall plant vigor in ornamental varieties. Use pepper application rates for ornamental peppers and herb rates for flowering herb species.

This formula is well suited for all pepper varieties (bell, jalapeño, habanero, ghost, Thai, poblano), culinary herbs (basil, cilantro, oregano, thyme, rosemary, sage, mint, parsley), and umbellifers (dill, fennel, celery, caraway, chervil). For micronutrient details, see Essential Micronutrients for Healthier Plants.

Yes — containers and grow bags are one of the best environments for this formula. Dissolve at the container rate (0.5–2g per gallon depending on pot size) and water until you see slight runoff from the base. Repeat every 2–3 weeks during active growth, and flush containers with plain water once a month to prevent salt buildup. See the Container & Grow Bag Feeding Guide in the How to Use section for specific rates by pot size.

Yes. This formula is well suited for both sweet and hot pepper varieties. The high soluble potash (40% K₂O) supports the nutrient balance associated with strong pepper performance across all Capsicum species — from mild bells to superhot varieties like ghost, scorpion, and Carolina reaper — especially from flowering through fruit development when potassium demand peaks.

Yes. Because this formula is 100% water soluble, it works well in drip systems, inline injectors, and fertigation programs. Dissolve completely in water before injecting, run at the correct dilution for your system, and always keep calcium products (Cal-Mag Plus or Calcium Nitrate) in a separate concentrated stock tank. Jar-test any unfamiliar combinations before running them through your irrigation lines.

• Manufactured in California, USA — family-owned and operated since 1989
• Independently tested by third-party laboratories for quality assurance
• Registered with the California Department of Food and Agriculture (CDFA)
• Every batch tested for heavy metal content — view latest heavy metal analysis

Not satisfied? We offer a 90-day money-back guarantee. Return the unused portion in its original packaging for a full refund.

• Recyclable packaging materials
• Formulated for targeted crop nutrition to help minimize waste
• Support for eco-friendly farming methods
• Ongoing research into sustainable solutions

1% of all profits go to the Greenway Foundation, focused on improving educational opportunities for children. Learn more at greenway.foundation.

Family-owned and operated since 1989, Greenway Biotech, Inc. has spent 35+ years formulating specialty fertilizers and wellness products from our facility in Madera, California. We believe gardens — and their humans — deserve better. That commitment to quality, transparency, and agronomic accuracy drives everything we make.