Grow More® Standard Fertilizer 05-10-40 — 25 lb

Potassium-Dominant Soluble Fertilizer for Hardening and Cool-Weather Crop Finish

Crops heading into cold stretches, transplant, or storage need cell-wall strength more than they need additional nitrogen-driven foliage. Grow More Standard Fertilizer 05-10-40 leans almost entirely on potassium, with just enough phosphorus and minimal nitrogen, to give crops the structural hardening that helps them tolerate cold and physical stress without pushing more vegetative growth at a stage where that growth isn't wanted.

Fully water-soluble and drip-compatible, the 25 lb bag dissolves clean enough for injection into drip lines, overhead sprinklers, and foliar programs on fruit close to harvest, leaving little to no visible residue on market-ready produce.

Key Features & Benefits

• 05-10-40 NPK Ratio: Potassium-dominant with moderate phosphorus and minimal nitrogen, calibrated for hardening and cool-condition growth.
• Cold-Stress Hardening: Built for cool climates, dark weather, and early spring, when potassium-driven structural support matters more than added nitrogen.
• Clean Foliar Option: Applies as a foliar feed on crops nearing maturity with little to no visible residue at harvest.
• Drip-Irrigation Compatible: Dissolves fully without clogging emitters, suited to fertigation at commercial scale.
• High-Purity Solubility: Formulated with highly soluble salts for consistent, predictable nutrient delivery batch after batch.

Who Should Use This

Commercial vegetable, fruit, and nursery producers hardening crops for transplant, shipping, or storage — or growing through a cool-climate stretch — are the direct fit. It also suits the final pre-harvest phase, where pushing potassium without added nitrogen supports brix and skin firmness. Compatible with most commercial nutrient and crop-protection programs, and often paired with a higher-nitrogen formula earlier in the cycle before transitioning to this one for finish.

About Grow More Inc.

Since its 1918 founding in Hollywood, California as National Chemical Company, Grow More Inc. — now based in Gardena, California — has built a fertilizer catalog spanning commercial field nutrition, ornamentals, and specialty crop feeding.

Frequently Asked Questions

What does hardening mean in a fertilization program?

Hardening means preparing plants for environmental stress — cold, transplant shock, or reduced water — by strengthening cell walls and improving osmotic regulation. Elevated potassium is the nutrient most directly tied to that structural resilience.

When during the crop cycle should I apply 05-10-40?

Use it during the final 2 to 4 weeks of production, or whenever cool temperatures or overcast conditions call for extra potassium support. Some programs run it through the full season where potassium-heavy nutrition is preferred throughout.

Can 05-10-40 be used in hydroponic systems?

Yes, its clean-dissolving solubility suits hydroponic reservoirs. Work it into your nutrient solution at rates calibrated to your EC targets, particularly during hardening and maturation.

How does 05-10-40 differ from Grow More's 05-50-17?

05-10-40 is potassium-dominant and suited to hardening, cool climates, and finish. 05-50-17 is phosphorus-dominant and better matched to flowering initiation and bud set, when phosphorus demand peaks instead.

Is 05-10-40 suitable for foliar application close to harvest?

Yes, it's labeled as a 100% soluble foliage spray for fruit and crops nearing maturity, leaving little to no visible residue — a fit for pre-harvest foliar programs on commercial crops. Market-ready produce can be sprayed close to harvest without a visible coating.