House & Garden CalMag powder is a concentrated Calcium/Magnesium supplement for your hydroponic, coco coir, greenhouse, and indoor grow operations. This dry soluble fertilizer is designed to promote rapid growth by delivering essential nutrients to your valuable crop.

Unlock Your Crop's Full Potential

Give your plants the essential nutrients they need to thrive. CalMag is expertly formulated to support your crop from seedling to harvest, ensuring stronger plants and preventing common issues that can impact your bottom line.

• Encourage Rapid Growth: The readily available Calcium and Magnesium formula encourages vigorous plant development and strengthens cell walls for more robust plants.
• Prevent Deficiencies: Effectively eliminates Calcium and Magnesium deficiencies, especially when using RO water or coco coir media.
• Increase Yields: Achieve up to 30% greater yields when used with H&G additives for an elevated feeding program.
• Improve Cost-Effectiveness: The highly concentrated powder formula offers a lower cost-per-use than other brands, making it an economical choice for large-scale operations.