PuurCalMag Organic Calcium + Magnesium Supplement

Organic Calcium + Magnesium Supplement 

Build structure. Prevent deficiencies. Grow strong from the roots up.

PuurCalMag is your plant’s structural support system. Designed to correct and prevent two of the most common deficiencies in cultivation—calcium and magnesium—this formula delivers clean, organic nutrition to reinforce growth at every stage.

Sourced from the earth, PuurCalMag combines calcium derived from mined limestone and magnesium extracted from deep-earth brine, then binds them with organic acetic acid (yes, vinegar!) to create a fast-absorbing, sediment-free formula. The result is a clean, highly available Cal-Mag supplement that keeps your plants growing strong—without clogging lines, leaving residue, or adding unnecessary salts.

🌍 Built with Sustainability in Mind

PuurCalMag is made using natural mineral sources and organic acids, not synthetic chelators or mined salts. Its ingredients are selected for purity, bioavailability, and low environmental impact.

• Clean-source calcium and magnesium

• No harsh preservatives, dyes, or fillers

• Safe for soil biology and regenerative practices

✅ Why Growers Love It:

• Prevents calcium and magnesium deficiencies in all grow systems

• Strengthens stems, roots, and cellular structure

• Improves nutrient transport and photosynthesis

• Fully soluble and sediment-free – won’t clog emitters or drip lines

• Clean, organic, and eco-conscious – no synthetic chelates or harsh additives

Whether you’re running a commercial system or a few pots at home, PuurCalMag is essential for maintaining healthy structure, maximizing uptake, and avoiding growth-limiting deficiencies.

🌿 Part of the Complete PuurOrganic Feed Program

PuurCalMag is a critical supplement to the Cronk Nutrients PuurOrganic Feed Program, ensuring that your base nutrients have the foundation they need to perform.

Use it alongside:

• PuurNitro – for lush green vegetative growth

• PuurPhos – for root development and flowering

• PuurK – for late-stage density and stress resistance

• PuurBalance – to enhance uptake and deliver complete micros

Together, these products form a fully customizable, clean and complete nutrient system that puts you in control of your plants’ health—without synthetic overkill or bottle clutter.

Safe for All Plant Types & Grow Mediums

At Cronk Nutrients, we pride ourselves on creating fertilizers that are compatible with a wide range of plants and growing mediums.

🌎 Compatibility
PuurCalMag works in all growing systems and media, including:
✔️ Soil
✔️ Soilless mixes (Pro-Mix HP, peat blends)
✔️ Coco coir (Pro-Mix CX, buffered coco)
✔️ Deep Water Culture (DWC)
✔️ Drip irrigation and automated systems
✔️ Living soil and organic no-till beds
✔️ Foliar spray applications

Great for all plant types, including:
🌿 Leafy greens, vegetables, and herbs
🌸 Flowering ornamentals and greenhouse crops
🌱 Potted plants and houseplants
🌾 Turf, lawn, and landscape
🌳 Fruiting trees, vines, and shrubs

Directions

SHAKE BEFORE USE

Dilute the suggested amount as per the chart on the back of the bottle into at least 1 litre of water. Apply once per week or every other watering. Safe to use in conjunction with any other nutrients. Use for the majority of the plant's life.

🌱 How to Use

Soil Application:

• Use 1–2 mL per 1 L or 4–8 mL per gallon
• Apply once per week or as needed

Hydroponic & Soilless Systems:

• Use 1.5–2.5 mL per 1 L or 6–10 mL per gallon
• Add to your reservoir weekly or with every feeding

Foliar Spray:

• Use 10–15 mL per 1 L or 38–57 mL per gallon
• Spray to the point of runoff throughout the grow as needed

🌿 Part of the Complete PuurOrganic Feed Program

PuurCalMag is a critical supplement to the Cronk Nutrients PuurOrganic Feed Program, ensuring that your base nutrients have the foundation they need to perform.

Use it alongside:

• PuurNitro – for lush green vegetative growth
• PuurPhos – for root development and flowering
• PuurK – for late-stage density and stress resistance
• PuurBalance – to enhance uptake and deliver complete micros

Together, these products form a fully customizable, clean and complete nutrient system that puts you in control of your plants’ health—without synthetic overkill or bottle clutter.

Conversions: 1 Teaspoon = 5mL | 1 Tablespoon = 15 mL | 1 Ounce = 30mL | 1 Cup = 240 mL

Guaranteed Analysis

Calcium (Ca)............4.00%

Magnesium (Mg) …..1.65%

Derived From: Calcium Carbonate, Magnesium Chloride

Safety Data Sheet

CLICK HERE for a copy of Cronk Nutrients PuurCalMag SDS

Shipping

Cronk Nutrients' online store ships all over Canada and the United States from Canada & the United States. If your country isn't a standard option, please contact us and we can get a shipping quote. We offer free shipping on any order in North America over $125* We ship via UPS, Purolator, FedEx, Canada Post or from our inventory at either Amazon.ca or Amazon.com. 

All orders are processed within 1 business day. 

Your order will be marked as fulfilled from the moment it’s been boxed up in the warehouse awaiting for the courier to pick it up. Once your order has been fulfilled, you will receive an email with your tracking number. Your tracking details will appear once the courier has processed the package.  CLICK HERE for more information about our shipping policy.