Emerald Harvest CalMag | Calcium-Magnesium

Emerald Harvest - CalMag (CALCIUM-MAGNESIUM SUPPLEMENT)

£19.99

Type: Mineral
Mineral feeds are dissolved minerals your plant can use straight away. They're fast-acting and precise, but it is possible to overdo them, so stick to the dose.

Calcium and Magnesium, When Plants Need Them

Pale leaves, yellowing between the veins and brown spots are classic signs of a calcium or magnesium shortage. They're especially common in soft-water areas, in coco, and in late flowering when heavy potassium feeds lock calcium and magnesium out.

Emerald Harvest Cal-Mag tops both up, keeping growth steady and helping your other feeds work properly.

Why It Works

Calcium: strong cell walls and healthy new growth
Magnesium: the centre of every chlorophyll molecule
Soft water: replaces minerals soft tap water lacks
Coco-friendly: offsets coco's habit of holding on to calcium and magnesium

For Houseplant & Garden Growers

Watering with rainwater or filtered water, or growing in coco or under LED lights? Those setups are where houseplants most often run short of calcium and magnesium.

For Growers

Dose: about 1.3ml per litre, when needed
When: from early growth through to late flowering
Important: don't use Cal-Mag and Sturdy Stalk in the same watering; alternate them
Mixing: add to the water first and stir before adding base nutrients

🌿 Rose's Pro-Tip: Soft water areas, which include much of the north and west of the UK, almost always benefit from a cal-mag. Hard-water areas usually need less.