CalMag Pro

CalMag Pro by Plagron is a liquid calcium and magnesium supplement designed to prevent and correct Ca/Mg deficiencies, with particular relevance for growers using RO water, soft water, or running LEDs at high intensity — all scenarios where calcium and magnesium demand increases.

The formula sources calcium and magnesium from multiple compounds for optimal plant uptake, rather than relying on a single salt. This multi-source approach improves bioavailability and reduces the risk of antagonism between Ca and Mg in the root zone. CalMag Pro is suitable across all growing media — soil, coco, hydro — and works alongside Plagron's full product range.

Use CalMag Pro from early veg through late bloom to prevent deficiencies proactively, or apply reactively at the first sign of interveinal yellowing (Mg) or tip burn and dying growing points (Ca). LED growers especially benefit from regular CalMag Pro supplementation since high-intensity light increases transpiration and accelerates calcium demand. Dosing is straightforward — follow Plagron's recommended rates and adjust based on EC and plant response.