5:1 Cal-Mag (Powder) Â Fast Acting pH Adjustment
Fast-acting, finely ground calcium and magnesium amendment for rapid correction. Ideal for pots, raised beds, soil blending, and situations where a quicker response is needed.
A finely milled blend of dolomite and limestone formulated at a 5:1 calcium to magnesium ratio. Designed to address deficiencies while gently raising low soil pH, this product supports root development, nutrient uptake, and overall plant performance.
The fine particle size increases surface area for faster soil reactivity, allowing for more immediate availability of calcium and magnesium. It also helps make nutrients already present in the soil more accessible, improving uptake efficiency and consistency.
In biologically active soils, calcium plays an important role in soil structure and microbial balance, while magnesium supports chlorophyll production and overall plant function. When used appropriately, this product helps create a more stable and productive root zone.
Application
Garden Beds, Raised Beds & Lawns 🌱
Apply 400–600 g per 10 m² (1–1.5 lbs per 100 ft²). For maintenance, test soil and reapply seasonally as needed.
Pots, Containers & Soil Blends 🪴
Apply 5 mL per gallon of soil volume when a slight adjustment or added calcium and magnesium is needed. Mix thoroughly into the growing media.
Greenhouse & Commercial Growing 🌿
Suitable for soil blending or targeted correction in larger systems. Apply based on soil test results and crop requirements.
Always test your soil before applying. Because this is a fast-acting fine powder, it reacts quickly and is easier to over-apply than coarser materials.
In living soil systems, this product is best used to address clear deficiencies or imbalances rather than for frequent adjustment. Over-application can disrupt nutrient balance and soil biology.
We offer lab soil analysis and can help determine the correct application rate based on your specific conditions.
This product is best suited for soils that are low in calcium and trending acidic. Where magnesium levels are already sufficient, the 5:1 ratio provides a more balanced option than standard dolomite lime.
Guaranteed Analysis
Calcium (Ca): 30%
Magnesium (Mg): 6%
This product complies with Canada’s Organic Production Systems General Principles & Management Standards and Permitted Substances Lists (CAN/CGSB-32.310-2021 CAN/CGSB-32.311-2020)
If you're pursuing or maintaining organic certification, we’re happy to provide documentation—just have your certifier contact us directly.
