Skip to main content

Send Us a Message

Search

Vivosun Cal+Mag+Iron (2-0-0) Plant Nutrient | 1 Quart

Official VIVOSUN Dealer Model: WEB-VSN-CAMGIR32J
  • Treats roughly 190 to 470 gallons at a dose of 2 to 5 ml per gallon
  • Formulated as a concentrated 2-0-0 liquid supplement with calcium, magnesium, iron, and nitrogen
  • Compatible with hydroponics, aeroponics, DWC, coco coir, and soil media
  • View More Details

Earn 39 points for shopping and get $0.39 off your next order. Join Harvest Club for free.

Questions? Talk to a specialist. Mon–Fri, 9am–5pm PST
Free Shipping On Most Items* To the lower 48
Transparent Pricing Backed w/ price match guarantee
Secure Checkout SSL encrypted payments

Questions? Talk to a specialist.

Mon to Fri, 9am to 5pm PST

Call (360) 800-5535
  • Free Shipping On Most Items*To the lower 48
  • Transparent PricingBacked w/ price match guarantee
  • 4.8/5 Top Quality Store on Google
  • Secure CheckoutSSL encrypted payments

Send Us a Message

Are you looking for a quote?
Ask Sage about this product
VOLUME PRICING

Commercial & Bulk Purchasing

We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.

Commercial Inquiry

Contact Information
THROUGH THE Cultivator's LENS Product Evaluation

  • You are maintaining coco coir or reverse osmosis systems because your feed water lacks the calcium and magnesium your plants need to avoid deficiencies
  • You are troubleshooting mid-grow leaf curling and stunted growth because an unexpected mineral shortfall is threatening your overall yield

  • The concentrated formula treats up to 470 gallons using a small dose per gallon
  • The 100 percent water-soluble blend mixes in seconds without leaving residue behind

  • Growers who added the supplement to their reverse osmosis water say they stopped seeing blossom end rot and interveinal chlorosis
  • Gardeners who use it across all growth stages say their plants show stronger cell structure and efficient photosynthesis

Vivosun Cal+Mag+Iron (2-0-0) Plant Nutrient | 1 Quart

Growing in media like a Vivosun coco coir brick or using reverse osmosis water can result in low calcium and magnesium levels. That shortfall shows up as blossom end rot, interveinal chlorosis, leaf curling, and stunted growth, often mid-grow when it's hardest to recover. Vivosun Cal+Mag+Iron is a concentrated 2-0-0 liquid supplement that prevents and corrects these deficiencies at a dose of just 2–5 ml per gallon.

The formula blends calcium, magnesium, iron, and nitrogen, the key elements for efficient photosynthesis, strong cell structure, and healthy flower and fruit development. It's 100% water-soluble and works in hydroponics, aeroponics, DWC, coco coir, and soil. It's fully compatible with other nutrient lines, such as the Vivosun Base A & B 2-Part Kit, and improves your plants' uptake of other supplements like Vivosun NutriBoost. Use it at every growth stage, indoors or outdoors, as a root feed or a foliar spray.

Because the formula is so concentrated, a single quart goes a long way. At 2–5 ml per gallon, one bottle treats roughly 190–470 gallons of feed water, enough to carry most home grows through several runs. It mixes in seconds with no residue, so you can add it to your existing feeding routine without changing your schedule, then fine-tune the dose until your plants respond the way you want.

Features

⚕️
Corrects Deficiencies

Prevents and treats blossom end rot, interveinal chlorosis, leaf curling, and stunted growth.

⚗️
Ca, Mg, Fe & N Blend

Balanced 2-0-0 formula supports photosynthesis, robust growth, and fruit development.

🥥
Built for Coco & RO

Restores the calcium and magnesium that coco coir and RO water lack.

💧
Works in Any Medium

100% water-soluble for hydroponics, aeroponics, DWC, coco coir, and soil.

🔗
Nutrient-Line Compatible

Pairs with any feeding program and improves uptake of other essential nutrients.

🌱
All Growth Stages

Apply from veg through flower as a root feed or foliar spray, indoors or out.

What's Included

  • Vivosun Cal+Mag+Iron 2-0-0 Supplement, 1 Quart (32 oz)

Specifications

Specification Value
NPK Ratio 2-0-0
Key Elements Calcium, magnesium, iron, nitrogen
Volume 1 quart (32 oz)
Form Liquid concentrate, 100% water-soluble
Dosage 2–5 ml per gallon
Target pH 5.5–6.5
Application Root feed or foliar spray
Compatible Media Hydroponics, aeroponics, DWC, coco coir, soil
Growth Stages All

How to Use

  1. Fill your container with water.
  2. Shake the bottle well, then add 2–5 ml of Cal+Mag+Iron per gallon.
  3. Stir gently until thoroughly mixed.
  4. Check the pH with a digital pH tester and adjust to 5.5–6.5 if needed using a Vivosun pH adjustment kit.
  5. Apply directly to the growing medium or use as a foliar spray.

Feeding tips:

  • Add Cal+Mag+Iron to your regular feed whenever you grow in coco coir or use RO water.
  • Adjust the dose based on your plant variety, growth conditions, and environment.
  • Reduce strength if plants show signs of stress or conditions are very bright, hot, or dry.

Warranty

Vivosun Cal+Mag+Iron is a consumable nutrient product sold as-is with no warranty.

Frequently Asked Questions

How much Cal+Mag+Iron should I use? +

Mix 2–5 ml per gallon of water. Start at the lower end and adjust based on your plants, growing medium, and environment, reducing strength if plants show stress or conditions are very bright, hot, or dry.

When do I need a Cal-Mag supplement? +

Cal-Mag is especially important when growing in media like an 11 lb coco coir brick or using reverse osmosis water, both of which are naturally low in calcium and magnesium. Signs of deficiency include blossom end rot, interveinal chlorosis, leaf curling or cupping, brittle leaves, and stunted growth.

Can I use it with my current nutrient line? +

Yes. Vivosun Cal+Mag+Iron is fully compatible with other nutrient systems and can be used on its own or alongside base nutrients and other additives. It also helps plants absorb other essential nutrients more efficiently.

Can I apply it as a foliar spray? +

Yes. After mixing and adjusting the pH, you can apply the solution directly to the growing medium or spray it onto leaves as a foliar feed. Both methods work at all growth stages.

What pH should my solution be? +

After mixing, check the pH with a Vivosun AeroLab P30 Digital pH Meter and adjust it to 5.5–6.5. Keeping the solution in this range helps plants absorb calcium, magnesium, and iron effectively.

Does it work in soil as well as hydroponics? +

Yes. The 100% water-soluble formula works in soil, coco coir, hydroponics, aeroponics, DWC, and any other growing medium or system, for both indoor and outdoor plants.

Happy To Help

Questions About This Product?

Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)

Call (360) 800-5535

Why Trimleaf

Equipping home growers, craft producers, and commercial operations across North America since 2016.

10+
Years of Specialist Knowledge
4.8★
2011+ Verified Reviews
50,000+
Growers Served
120+
Top Equipment Brands in Stock