Botanicare Cal-Mag Plus Supplements

Use Cal-Mag Plus with every watering throughout the entire growth cycle, from seedling through harvest. Add 1 teaspoon (5 ml) per gallon of water, mix thoroughly, and adjust pH to 6.2-7.0 before application. For young plants, establishing a strong root system with Botanicare Rhizo Blast Root Stimulator ensures they can efficiently utilize these minerals. Shake the bottle well before each use.

Reverse osmosis water removes beneficial minerals including calcium and magnesium, while coco coir naturally binds calcium, making it unavailable to plants. Without supplementation, fast-growing crops quickly develop severe deficiencies. To maintain a healthy root zone in these conditions, many professionals also incorporate Botanicare Hydroguard Root Inoculant alongside their Cal-Mag regimen.

Blossom end rot in tomatoes and peppers is caused by calcium deficiency during rapid fruit development. Cal-Mag Plus provides immediately available calcium that prevents the characteristic dark, sunken spots on fruit bottoms. Consistent application throughout the flowering and fruiting stages maintains adequate calcium levels for proper cell wall development.

Yes, foliar application delivers rapid correction of visible deficiency symptoms. Mix 10-15 ml per gallon of water and spray directly onto foliage for faster uptake through leaves. This method is particularly effective for quickly addressing interveinal chlorosis or when plants show acute deficiency symptoms between regular feedings.

Absolutely—Cal-Mag Plus is formulated for universal compatibility with any base nutrient program. The low NPK ratio and balanced mineral content complement rather than compete with your existing feeding schedule. Many growers use it alongside Botanicare Pure Blend Pro Grow Nutrients or other preferred programs without experiencing nutrient lockout or imbalances.

Common deficiency symptoms include yellowing between leaf veins (interveinal chlorosis), brown spotting on leaves, stunted growth, and weak stems. If stems are weak or brittle, adding Botanicare Silica Blast Supplements can help improve plant rigidity. If you're using RO water, LED lighting, or coco coir, preventative supplementation is recommended regardless of visible symptoms.

The 1 quart size covers hobbyist grows with 2-6 plants for several weeks, while the 1 gallon suits medium operations with 10-15 plants. Commercial growers or those running perpetual harvests should consider the 2.5 or 5 gallon options for better value—at 5 ml per gallon per watering, larger sizes significantly reduce per-application costs and reorder frequency.