Botanicare Cal-Mag Plus 2-0-0 | 2.5gal

Fast-Absorbing Cal-Mag Supplement for RO Water and Coco Coir, 2.5gal

Reverse osmosis water and coco coir media both strip or tie up calcium and magnesium in ways municipal water and soil don't, leaving plants short on those nutrients even when a base feeding program looks complete on paper. Botanicare Cal-Mag Plus 2-0-0 delivers calcium, magnesium, and iron in a fast-absorbing liquid form, correcting those common deficiencies for growers running RO water or coco coir.

The 2.5gal size suits growers between the 1gal and 5gal options, mixing solution on a regular but not high-volume basis.

Key Features & Benefits

• 2-0-0 Cal-Mag-Iron Formula — delivers calcium, magnesium, and iron without adding nitrogen, phosphorus, or potassium to a base program.
• Fast-Absorbing Liquid Form — mixes into a reservoir or is applied as a foliar spray for quicker uptake.
• Corrects RO Water and Coco Coir Deficiencies — targets the specific calcium and magnesium shortfalls those growing methods create.
• Reservoir or Foliar Application — mix into the nutrient reservoir or spray directly on foliage.

Who Should Use Cal-Mag Plus

Growers using reverse osmosis water or coco coir media, who need to correct calcium and magnesium deficiencies those methods commonly create, are the fit for Cal-Mag Plus.

About Botanicare

Botanicare, founded by Treg Bradley in Chandler, Arizona, has been part of the Hawthorne Gardening Company portfolio since Hawthorne Hydroponics, a Scotts Miracle-Gro subsidiary, acquired the brand in 2016.

Frequently Asked Questions

Why do RO water and coco coir cause calcium and magnesium deficiencies?

Reverse osmosis water strips out the calcium and magnesium that municipal or well water would normally supply, and coco coir naturally ties up calcium and magnesium through cation exchange. Cal-Mag Plus is formulated specifically to correct the shortfall those two conditions create.

How do I apply Cal-Mag Plus?

Mix it into the nutrient reservoir alongside your base feeding program, or apply it as a foliar spray for visibly healthier foliage. Follow the label's dilution rate rather than adding it at full strength.

Does Cal-Mag Plus replace my base nutrient program?

No, it's a 2-0-0 supplement that adds calcium, magnesium, and iron without nitrogen, phosphorus, or potassium, so it's meant to layer onto a complete base program rather than replace it. Continue your regular feeding schedule alongside it.

What size Cal-Mag Plus should I buy?

Sizes run from 32oz bottles for smaller setups up through 250gal totes for large commercial operations, with 1gal, 2.5gal, and 55gal sizes in between. Match the size to your reservoir volume and how often you mix nutrient solution.