Jack's Nutrients Magnesium Sulfate Epsom Salts vs General Hydroponics MaxiGro

These are not substitutes. Jack's Magnesium Sulfate is a single-ingredient magnesium and sulfur boost, while MaxiGro is a complete NPK 10-5-14 vegetative feed with micronutrients. Buy Jack's if you already run a base nutrient program and need to correct magnesium or sulfur, especially in coco or under LEDs. Buy MaxiGro if you want one powder that feeds seedlings and vegetative growth from start to finish. On build, Jack's is a plain 25 lb bag of agricultural-grade heptahydrate; MaxiGro is a smaller, pH-buffered soluble with a fuller nutrient profile. Owners of MaxiGro rate it well for easy mixing and steady vegetative growth; Jack's is valued for purity and low heavy-metal content rather than for feeding a plant alone.

• Choose the Jack's Magnesium Sulfate if you already feed a complete base nutrient and need a pure Mg and S supplement, or you follow the Jack's 3-2-1 program.
• Choose the MaxiGro if you want a single dry powder that covers primary, secondary and micronutrients for seedlings, cuttings and vegetative growth.