Grow More® Mendocino 0-37-37 Fertilizer — 25 lb

Extreme-Concentration PK Supplement Added on Top of an Existing Fertilizer Program

Base fertilizers alone often can't deliver the phosphorus and potassium spike that peak flowering and fruiting demand without also adding more nitrogen than a program calls for. Grow More Mendocino 0-37-37 solves that by supplying phosphorus and potassium at extreme concentration with zero nitrogen, letting growers push PK levels independently during flowering and fruiting without disturbing a carefully managed nitrogen reduction.

Fully water-soluble, the 25 lb bag is designed as a supplement rather than a standalone feed, layering into drip, overhead, or hand-watering programs already built around a complete base fertilizer.

Key Features & Benefits

• 0-37-37 NPK Ratio: Extreme phosphorus and potassium concentration with zero nitrogen, purpose-built for PK-only supplementation.
• Nitrogen-Free: Lets growers raise phosphorus and potassium independently during flowering without disrupting a nitrogen-reduction program.
• 100% Water Soluble: Dissolves cleanly for drip, overhead fertigation, or hand-watering with no residue or clogging.
• Built as a Supplement: Layers on top of a complete soil-applied base program rather than replacing it, adding precision PK control.
• Commercial 25 lb Format: Sized for consistent, high-volume PK supplementation across production cycles.

Who Should Use This

Experienced commercial growers who already understand their crop's nutritional program and want independent, precise control over phosphorus and potassium during flowering and fruiting are the direct fit. Dissolve separately in water before combining with other nutrients, and always pH-adjust the finished solution for your crop and system.

About Grow More Inc.

Grow More Inc. has manufactured fertilizers since 1918, beginning as National Chemical Company in Hollywood, California and now headquartered in Gardena, California, with a Mendocino supplement line built around targeted phosphorus, potassium, and biological inputs.

Frequently Asked Questions

How is 0-37-37 used within a production fertilizer program?

It's added on top of an existing base fertilizer program as a supplemental PK boost during flowering and fruiting, when phosphorus and potassium demand peaks. It is not a complete fertilizer on its own, so calculate the additional phosphorus and potassium it contributes against your existing program to avoid over-supplementing.

What crops benefit most from high PK supplementation at bloom?

Fruiting vegetables, flowering crops, and any high-yield production system where bloom count, size, and density drive economic return see the most benefit. The combined 37% phosphorus and 37% potassium addresses both the energy-transfer demands of flowering and the structural needs of developing fruit.

Can 0-37-37 be mixed with calcium or magnesium supplements?

High-phosphorus fertilizers can react with calcium to form insoluble precipitates if combined incorrectly. Dissolve each product separately first, add calcium-containing products to the final diluted solution rather than the concentrate, and watch for cloudiness that would signal incompatibility.

What is the recommended application rate for 0-37-37?

Rates vary by crop, growth stage, existing nutrient program, and water quality. Start at the lower end of the Grow More application guide and adjust based on plant response and EC targets.

Is 0-37-37 compatible with certified organic programs?

No, this is a synthetic water-soluble fertilizer and isn't approved for certified organic use. Organic operations needing PK supplementation should look for OMRI-listed phosphate and potassium inputs instead.