Emerald Harvest Cal-Mag 1L — Calcium & Magnesium Additive

Emerald Harvest Cal-Mag 1L — Calcium 3% & Magnesium 0.5% Crop Saver

Prevent and treat nutrient deficiencies with Emerald Harvest Cal-Mag — a calcium (3%) and magnesium (0.5%) additive. Particularly important in coco coir, which holds onto calcium causing deficiencies; Cal-Mag is a real crop-saver in coco. Whatever your media, the formulation provides chelation to help nutrient absorption. Doesn't just prevent deficiencies — actively improves growth. Calcium regulates growth, magnesium is key for chlorophyll production.

Why growers choose Emerald Harvest Cal-Mag:

• 3% calcium + 0.5% magnesium — proper ratio addressing the most common deficiency combo
• Crop-saver in coco coir — coco binds Ca naturally, this addresses it
• Chelated for absorption — keeps Ca and Mg bioavailable across pH range
• Improves growth, not just prevents deficiency — performance benefit beyond rescue
• Calcium regulates growth — structural macronutrient supporting cell wall formation
• Magnesium drives chlorophyll production — key for photosynthesis
• USA-formulated quality — Emerald Harvest's Californian standards

Who it's not for:

Check your tap water EC before ordering. UK tap water is often already hard (EC 0.6-0.8+) — if yours is, you don't need CalMag and over-supply causes other problems. Most useful for RO users, soft-water rural areas, or coco growing specifically. For similar products: Canna CalMag, Athena CaMg, Mills CalMag, VitaLink CalMag, Shogun CalMag are all alternatives. Not a base nutrient.

Available to collect from our Stone shop at Unit 24, Emerald Way, ST15 0SR — or ships the same working day from our UK warehouse. Not sure if this is the right fit? Give us a ring on 01785 556355 or email sales@roots2riches.com — we're growers ourselves, happy to help.