• Wear chemical-resistant gloves when handling concentrated powder or stock solutions
• Use safety glasses or goggles to protect against dust or splash
• Avoid inhaling powder dust — mix in a well-ventilated area or use a dust mask
• Wash hands thoroughly with soap and water after handling

• Store dry powder in original sealed container in a cool, dry location
• Keep away from direct sunlight and heat sources — excessive heat can cause caking
• Store stock solutions in opaque, sealed containers away from light
• Keep out of reach of children and pets
• Do not store near incompatible materials (strong oxidizers, acids)

• Never mix concentrates directly together — always dilute each product in water individually before combining in the reservoir
• Mixing order is critical: Cal-Mag Plus → Micro Green → Grow Green → Blossom Green → pH adjust last
• Do not combine with nutrients from other manufacturers without testing — incompatible formulas can cause precipitation and nutrient lockout
• Monitor reservoir EC regularly — salt buildup in recirculating systems requires periodic reservoir changes
• Flush growing media every 2–4 weeks with plain water to prevent salt accumulation

• Eye contact: Flush with clean water for 15 minutes, holding eyelids open. Seek medical attention if irritation persists.
• Skin contact: Wash affected area with soap and water for at least 10 minutes. Remove contaminated clothing.
• Ingestion: Do not induce vomiting. Rinse mouth with water. Contact Poison Control (1-800-222-1222) or seek medical attention immediately.
• Inhalation: Move to fresh air immediately. Seek medical attention if coughing, shortness of breath, or other symptoms persist.

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

Yes. Match the ppm-N of your current liquid product using the feeding schedule, and you'll see equal or better results at 50–70% lower cost per finished gallon. Because Grow Green's nitrogen concentration (4%) is double that of typical 2-1-6 liquids, you'll use less product to hit the same target EC. See our full guide to choosing the best hydroponic fertilizers for more detail on making the switch.

Yes — Grow Green provides only macronutrients (N, P, K, plus background Mg and S). You must pair it with Micro Green 2-0-3 to supply chelated trace elements including iron, manganese, zinc, copper, boron, and molybdenum. This separation allows precise micronutrient adjustment based on your water source and crop type.

Calcium and phosphorus form an insoluble precipitate (calcium phosphate) when mixed directly together. Adding Cal-Mag Plus to plain water first — before any phosphate-containing nutrients — prevents this reaction. Always follow the order: Cal-Mag → Micro Green → Grow Green → Blossom Green → pH adjustment last.

Grow Green contains double the nitrogen (4% vs. 2%) and slightly higher phosphorus compared to typical 2-1-6 liquid grow formulas. This means you use less product to achieve the same target ppm-N, compounding cost savings. The higher nitrogen also supports faster vegetative growth rates for heavy-feeding crops like tomatoes and cucumbers.

Yes. For soil, use the early vegetative rate (5 ml/gal stock solution) and apply when the top inch is dry. For coco coir, follow the hydroponic feeding schedule — coco requires daily watering and should never fully dry out. In both cases, check runoff EC periodically to prevent salt buildup in containers.

Stock solutions stored in a sealed, opaque container in a cool, dark place last 6+ months. The dry powder has an indefinite shelf life when kept dry and sealed. Always shake stock solutions before use as minor settling can occur. If you notice cloudiness or precipitation in the stock bottle, check that your mixing water doesn't contain hard water minerals — use RO or distilled water for stock preparation when possible.

Run a 1–2 week transition period rather than switching abruptly. During weeks 7–8, use 10 ml/gal of both Grow Green and Blossom Green simultaneously. Then drop Grow Green to 5 ml/gal in early bloom while increasing Blossom Green to 15 ml/gal. By peak bloom (week 11+), Grow Green drops to 0 and Blossom Green carries the program. This gradual shift prevents the nitrogen crash and yellowing that often occurs with abrupt formula changes. For a complete walkthrough, see our guide to growing hydroponic tomatoes.

• Formulated and packaged in California, USA — in production since 1989
• Tested by independent third-party laboratories for quality and consistency
• Registered with the California Department of Food and Agriculture (CDFA)
• Independently tested for heavy metal content — documentation available upon request
• Consistent lot-to-lot elemental ratios verified before release

• Powder format reduces shipping weight by ~90% compared to equivalent liquid nutrients
• Significantly lower carbon footprint per nutrient unit delivered
• Minimal packaging compared to multi-bottle liquid systems
• Precise formulation supports efficient nutrient uptake and reduces excess runoff

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

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