Jack's Nutrients Magnesium Sulfate Epsom Salts vs Cropsalt 1lb Starter Pack

These are not rivals. Jack's Magnesium Sulfate is a single-ingredient magnesium and sulfur booster for the Jack's 3-2-1 program or any feed that runs low on Mg. Cropsalt is a complete multi-part feed: Veg A/B, Bloom A/B and Cake cover a whole grow from seedling to finish. Buy Jack's if you already have a base nutrient and just need Mg and S. Buy Cropsalt if you want one line to run start to finish. Owners rate Cropsalt highly and call it simple and pH stable, though one reviewer hit a lockout in veg.

• Choose the Jack's Magnesium Sulfate if you already run a base nutrient and need a cheap, pure Mg and S boost for coco, RO water or low-magnesium soil.
• Choose the Cropsalt Starter Pack if you want a complete A/B plus bloom and finisher program in one box and prefer weighing a few grams per gallon.