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 190 to 470 gallons of feed water per quart.
  • Compatible with all irrigation systems including hydroponics and soil.
  • Formulated for high solubility to prevent residue in nutrient lines.
  • 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

Send Us a Message

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 Hands-On Evaluation

  • You are using coco coir or reverse osmosis water because your plants keep showing signs of leaf curling and chlorosis.
  • You are adding a dedicated mineral supplement because your main nutrient line lacks enough calcium for your fruit set.

  • We recommend this for anyone using reverse osmosis because it balances the low mineral content of the source water.
  • The 2-0-0 concentration is high enough that you only need a few milliliters per gallon to see a change in growth.

  • Users who dealt with blossom end rot say their plants stopped dropping fruit once they added this to the routine.
  • Growers who struggled with slow development in coco coir report faster growth once they started using this supplement.

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

Coco coir and reverse osmosis water are both low in calcium and magnesium. 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 and improves your plants' uptake of the other nutrients you feed. 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 and adjust to 5.5–6.5 if needed.
  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 coco coir 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 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★
1994+ Verified Reviews
50,000+
Growers Served
120+
Top Equipment Brands in Stock