Grow More® Mendocino Producer's Choice Plant Starter 10-52-10 — 25 lb

Very High-Phosphate Rooting Powder Built to Shorten the Establishment Window

Root development determines the trajectory of an entire crop cycle, and a slow start during propagation or transplanting is difficult to make up later. Grow More Mendocino Producer's Choice Plant Starter 10-52-10 builds a rooting and transplant formula around an extremely high 52% phosphate concentration, balanced by equal 10% nitrogen and potassium — the classic high-P profile professional growers use to accelerate root development and ease transplant shock.

As part of the Mendocino Producer's Choice series, the 25 lb bag dissolves completely with no residue, delivering an intense phosphate boost precisely when young plants and transplants need it most.

Key Features & Benefits

• 52% Phosphate for Rapid Root Development: Very high available phosphate powers root cell division, ATP energy transfer, and the metabolic processes critical to fast root establishment.
• Reduces Transplant Shock: Supports root recovery after transplanting, shortening the recovery period that can delay early crop development.
• Balanced 10% N and K: Provides foundational macronutrient support without overdriving vegetative growth while roots are the priority.
• Broad Application: Suited to seedlings, cuttings, plug transplants, and plants moving to larger containers.
• 100% Water-Soluble: Dissolves completely with no insoluble residue for seed trays, propagation systems, and drip applications.

Who Should Use This

Propagators, nursery operators, and any grower who regularly seeds, clones, or transplants crops are the direct fit, particularly during the first two to four weeks after transplanting or rooting when phosphate availability most directly influences establishment success.

About Grow More Inc.

Grow More Inc., founded in 1918 as National Chemical Company in Hollywood, California and now based in Gardena, California, positions Plant Starter as the establishment-phase formula in its Mendocino Producer's Choice powdered line.

Frequently Asked Questions

Why is such high phosphate (52%) used in a plant starter formula?

Phosphate is the primary macronutrient driving root cell division and ATP energy transfer. During early establishment, a young plant's priority is building a productive root system, and the very high phosphate concentration directly supports that priority.

When should I stop using Plant Starter and switch to a vegetative formula?

Transition once the root system is visibly established, typically 2 to 4 weeks after transplanting, when new shoot growth is vigorous and roots have filled or are approaching the container edges. Continuing past that point without adjusting the ratio can leave the plant short on nitrogen and potassium during active vegetative growth.

Can I use this throughout the vegetative stage?

It's optimized for the establishment phase, and using it through the full vegetative stage would supply excess phosphate beyond what established root systems need. Transition to a formula with more balanced N-P-K ratios once roots are established.

Is Plant Starter 10-52-10 suitable for hydroponic propagation systems?

Yes, the 100% water-soluble formula is compatible with rockwool, perlite, coco coir, and water-based propagation systems. Use at the recommended rate in a diluted solution appropriate for young plant root systems.