Micro Green 2-0-3
Micro Green 2-0-3
Micro Green 2-0-3
The essential micronutrient foundation of our 4-part hydroponic system. Seven trace elements — including chelated iron, zinc, manganese, and copper — deliver continuous deficiency protection throughout every growth stage.
Ideal Applications
FEATURES
🔬 Complete 7-Element Micronutrient Profile
Supplies all seven essential trace elements — boron, iron, zinc, calcium, manganese, copper, and molybdenum — in a single concentrated powder, eliminating the need for multiple micronutrient supplements.
⚗️ EDTA-Chelated Iron, Zinc, Manganese & Copper
Four of the seven elements are EDTA-chelated, maintaining solubility and plant availability across a wide pH range — critical in hydroponic reservoirs where pH fluctuation is common.
🌱 Use Through Every Growth Stage
Unlike macronutrients that shift dramatically from veg to bloom, micronutrient demand remains consistent from seedling to harvest. Micro Green 2-0-3 is designed to run continuously at the same rate.
💰 Concentrated Powder Reduces Cost Per Feed
Powder form eliminates water weight, significantly lowering shipping costs compared to liquid micronutrient products of equivalent concentration. A 1.5 lb package yields 1 gallon of stock solution.
🌿 Light NPK Carrier Supports Without Disrupting
The 2-0-3 NPK ratio adds a small nitrogen and potassium contribution to your reservoir without competing with the primary ratios dialed in by Grow Green or Blossom Green.
🧪 CDFA Registered — Verified Nutrient Claims
Registered with the California Department of Food and Agriculture, meaning the guaranteed analysis on every label is independently verified for accuracy and compliance.
🔩 Formulated as Part of a 4-Part System
Designed to integrate precisely with Cal-Mag Plus 2-0-0, Grow Green 4-2-6, and Blossom Green 2-6-8 — each product fills a distinct nutritional role without overlap or deficiency gaps.
🌡️ Tested for Heavy Metals
Independently lab tested for heavy metal content, providing confidence for both food crops and medicinal plants where contamination standards are strict.
💡 Prevents the Most Common Hydroponic Deficiencies
Interveinal chlorosis (iron/manganese), stunted new growth (zinc/boron), and poor flower set (boron/molybdenum) are the most frequently reported hydroponic issues — all addressed in one formula.
📦 Multiple Package Sizes for Every Operation
Available in 1.5 lb, 3 lb, 7.5 lb, and 15 lb sizes — from hobbyist reservoirs to commercial recirculating systems — with stock solution concentrations that scale linearly.
DERIVED FROM
Micro Green 2-0-3 sources each element from the form best suited for solubility and plant uptake in hydroponic environments. Iron, zinc, manganese, and copper are EDTA-chelated for reservoir stability. Boron and molybdenum are supplied as mineral salts — their ionic forms are directly plant-available and do not require chelation.
Chelated Micronutrient Sources
Chelated Iron EDTA 13%
EDTA-protected iron for chlorophyll synthesis and photosynthesis. Stays soluble at typical reservoir pH of 5.5–6.5.
Chelated Zinc EDTA 14%
EDTA-protected zinc for protein synthesis, auxin regulation, and cold-stress tolerance. Prevents small-leaf and stunting symptoms.
Chelated Manganese EDTA
EDTA-protected manganese for photosystem II function and enzyme activation. Interveinal chlorosis on newer leaves is the classic deficiency sign.
Chelated Copper EDTA 14%
EDTA-protected copper for lignin synthesis, stem strength, and reproductive processes including flower and seed formation.
Mineral Sources
Boric Acid 17% B
Water-soluble boron source for cell wall integrity, pollen viability, sugar transport, and carbohydrate metabolism. Not chelated — ionic borate is directly available.
Sodium Molybdate 39% Mo
Highly soluble molybdenum source for nitrate reductase enzyme function — essential for converting nitrate into usable amino acids and proteins.
Macronutrient Carrier
Calcium Nitrate
Contributes the 2% nitrogen and provides the calcium fraction in the formula. Calcium supports cell wall integrity in developing leaves and roots.
Potassium Sulfate 0-0-53
Supplies the 3% potassium in the formula with a sulfate carrier — a clean, chloride-free potassium source suited for sensitive crops.
SCIENCE BEHIND THE FORMULA
2-0-3: A Micronutrient Delivery Vehicle
The 2-0-3 NPK is intentionally modest — Micro Green's job is to deliver trace elements, not to drive primary growth. The light nitrogen and potassium serve as a carrier matrix and contribute a small supporting role in the nutrient profile, while the active work is done by the seven trace elements inside.
🌿 Nitrogen — 2% (Support Role)
A low nitrogen level keeps Micro Green compatible across all growth stages without over-amplifying vegetative growth during bloom. Nitrogen here comes from calcium nitrate, bringing along the calcium fraction as a secondary benefit.
⭕ Phosphorus — 0%
No phosphorus is included — by design. Phosphorus and calcium can precipitate in concentrated stock solutions. Keeping Micro Green phosphorus-free prevents compatibility issues when mixing in sequence with Cal-Mag Plus.
⭐ Potassium — 3% (Baseline Support)
A modest potassium contribution from potassium sulfate adds to the overall K pool in the reservoir. The sulfate form is chloride-free and suitable for chloride-sensitive crops like strawberries, lettuce, and herbs.
The Seven Trace Elements — What Each One Does
🩸 Chelated Iron (Fe) — Chlorophyll & Energy
Central to chlorophyll molecule synthesis and electron transport in photosynthesis. Iron deficiency produces interveinal chlorosis on the youngest leaves first — one of the most common hydroponic problems, especially as pH drifts above 6.5.
🔩 Chelated Zinc (Zn) — Growth Regulation
Controls auxin production (the hormone driving stem elongation) and is essential for protein synthesis. Zinc-deficient plants develop small, distorted new leaves and struggle with cold temperatures. Deficiency is especially common in coco coir.
☀️ Chelated Manganese (Mn) — Photosystem II
A required component of Photosystem II — the part of photosynthesis that splits water molecules. Without sufficient manganese, the chloroplast cannot generate the electrons needed to drive carbon fixation.
🌰 Chelated Copper (Cu) — Structural Strength
Activates enzymes for lignin biosynthesis, giving stems their structural rigidity. Copper is also essential for cytochrome c oxidase in cellular respiration. Deficiency causes wilting and blue-green leaf discoloration.
🌸 Boron (B) — Pollination & Cell Walls
Required for pollen tube germination, flower formation, and the structural integrity of primary cell walls through cross-linking with pectin. Research has also demonstrated that adequate boron improves phosphorus and potassium uptake at the root membrane level.
🧬 Molybdenum (Mo) — Nitrogen Conversion
Powers the nitrate reductase enzyme that converts nitrate (NO₃⁻) into ammonium for amino acid synthesis. Without molybdenum, nitrate accumulates unused even when nitrogen is abundant — often misdiagnosed as nitrogen deficiency.
🧱 Calcium (Ca) — Cell Wall Integrity
Strengthens primary and secondary cell walls by cross-linking pectin chains. Calcium is immobile in the plant — deficiency symptoms appear first in young leaves and growing tips, presenting as tip burn, distorted leaves, and poor fruit set.
Why Chelation Matters in Hydroponics
🔐 Chelates Prevent Precipitation
In an unchelated solution, iron, zinc, manganese, and copper readily form insoluble hydroxides and phosphates as pH rises. EDTA chelation keeps these elements in solution and available for root uptake across the 5.5–6.5 pH range used in hydroponics.
🕐 Extended Reservoir Life
Chelated micronutrients remain active in a reservoir for its full weekly cycle rather than precipitating out within hours. This is why Micro Green recommends storing stock solution in a dark container — light degrades EDTA chelate bonds over time.
APPLICATION RATES & DIRECTIONS
Stock Solution Preparation
| Package Size | Water Needed | Stock Solution Yield | Shelf Life |
|---|---|---|---|
| 1.5 lbs | 1 gallon | 1 gallon concentrate | 6+ months (dark container) |
| 3 lbs | 2 gallons | 2 gallons concentrate | 6+ months (dark container) |
| 7.5 lbs | 5 gallons | 5 gallons concentrate | 6+ months (dark container) |
| 15 lbs | 10 gallons | 10 gallons concentrate | 6+ months (dark container) |
Complete 4-Part System Feeding Schedule (ml of stock solution per gallon)
| Growth Stage | Cal-Mag Plus 2-0-0 | Grow Green 4-2-6 | Micro Green 2-0-3 | Blossom Green 2-6-8 | EC Target | pH Range |
|---|---|---|---|---|---|---|
| Seedlings/Clones — Week 1–2 | 2.5 | 1.25 | 1.25 | 1.25 | 0.5–0.8 | 5.5–6.5 |
| Early Vegetative — Week 3–4 | 5 | 5 | 5 | 5 | 1.0–1.4 | 5.5–6.5 |
| Late Vegetative — Week 5–6 | 7.5 | 15 | 10 | 5 | 1.4–1.8 | 5.5–6.5 |
| Transition — Week 7–8 | 10 | 10 | 10 | 10 | 1.6–2.0 | 5.5–6.5 |
| Early Bloom — Week 9–10 | 10 | 5 | 10 | 15 | 1.8–2.2 | 5.5–6.5 |
| Peak Bloom — Week 11–13 | 10 | 0 | 10 | 20 | 2.0–2.5 | 5.8–6.5 |
| Late Bloom/Flush — Week 14+ | 5 | 0 | 7.5 | 15 | 1.5–2.0 | 5.8–6.5 |
Hydroponic System Guidelines
| System Type | Feed Schedule | Special Notes | Reservoir Change |
|---|---|---|---|
| DWC/RDWC | Continuous | Monitor pH daily — iron chelate most sensitive to drift | Weekly |
| NFT | Continuous | Check EC twice daily; thin film accelerates evaporation | Weekly |
| Ebb & Flow | 2–4x daily | Adjust concentration for flood frequency | Weekly |
| Drip/DTW | Multiple daily | Maintain 10–20% runoff for salt prevention | N/A |
| Coco Coir | 1–2x daily | Never allow to dry; coco has high cation exchange capacity | N/A |
| Aeroponics | 15-min cycles | Use 75% concentration; fine mist increases absorption efficiency | Weekly |
Soil & Foliar Applications
| Application Method | Rate (stock solution) | Frequency | Notes |
|---|---|---|---|
| Soil Drench | 5–10 ml/gal | Weekly | Apply to pre-moistened soil |
| Foliar Spray | 2.5–5 ml/gal | Bi-weekly | Early morning or evening; avoid direct sun |
| Fertigation | 5–10 ml/gal | With each watering | Through drip or overhead irrigation |
HOW TO USE
Preparing Stock Solution
- Measure the appropriate amount of Micro Green powder (see package size table above).
- Add to the specified volume of clean, room-temperature water — RO or low-EC source water preferred.
- Stir thoroughly until fully dissolved.
- Let the solution stand for 30 minutes after mixing — this allows chelate bonds to fully stabilize.
- Transfer to a dark, opaque container with a tight-fitting lid. Label with date.
- Stock solution is stable for 6+ months when stored in the dark.
Adding to Hydroponic Reservoir
- Fill reservoir with fresh water first. Never add nutrient concentrates to an empty reservoir or directly to each other.
- Add Cal-Mag Plus stock solution first and allow to fully mix and dissolve before proceeding.
- Add Micro Green stock solution second at the rate appropriate for your growth stage.
- Add Grow Green (veg) or Blossom Green (bloom) third.
- Stir or circulate reservoir, then check and adjust pH to 5.5–6.5.
- Verify EC/TDS against target range for the current growth stage.
Foliar Application for Deficiency Correction
- Mix 2.5–5 ml stock solution per gallon of clean water in a spray bottle.
- Apply in early morning or evening — avoid hot midday application to prevent leaf burn.
- Spray the undersides of leaves as well as the tops, where stomatal absorption is highest.
- Allow foliage to dry before lights-on in indoor grows.
- Repeat every 5–7 days until deficiency symptoms resolve, then revert to normal reservoir dosing.
Pro Tip: Never Skip Micronutrients During Flush
Many growers drop micronutrients during the final flush week — this is a mistake. The Late Bloom/Flush rate (7.5 ml/gal) is maintained specifically because deficiency symptoms can emerge rapidly in the final weeks when the plant is heavily loaded with developing fruits. A complete flush simply means reducing macronutrient EC, not eliminating trace elements entirely.
When Micro Green 2-0-3 Is the Right Choice
- You're running any hydroponic, coco, or soilless system and need a proven, complete trace element solution
- You're already using Cal-Mag Plus, Grow Green, or Blossom Green and want a formulated system match
- You're seeing interveinal chlorosis, stunted new growth, or weak flowering in your reservoir-grown plants
- You want one product that covers all micronutrient bases without managing seven separate supplements
When to Consider Other Options
- You need a standalone iron correction for a soil plant — consider Chelated Iron EDTA 13% or Chelated Iron DTPA 11% for targeted, single-element treatment
- You're growing in rich living soil with high organic matter — natural microbial activity typically releases adequate trace elements; Micro Green is optimized for inert media
- Your crop has a specific, documented single-element deficiency confirmed by a soil or tissue test — a targeted chelated product will resolve it faster at lower cost
MICRO GREEN CALCULATOR
SAFETY & HANDLING
Personal Protective Equipment (PPE)
- Wear gloves when handling powder or stock solution — concentrated chelated minerals can be a skin irritant
- Wear eye protection when measuring or mixing powder — fine dust can cause eye irritation
- Use a dust mask when working with the powder in poorly ventilated spaces
- Wash hands thoroughly with soap and water after handling
Storage Guidelines
- Store powder in a cool, dry location in the original sealed container
- Keep away from direct sunlight and heat sources
- Store stock solution in a dark, opaque container — light degrades EDTA chelate bonds
- Keep out of reach of children and pets
- Do not store near food, feed, or drinking water supplies
Application Precautions
- Always add to water — never mix concentrated stock solutions directly together
- Follow the mixing order: Cal-Mag Plus first, Micro Green second, Grow/Blossom Green third
- Do not exceed recommended application rates — copper and zinc can reach phytotoxic levels at high concentrations
- Avoid prolonged skin contact with stock solution during extended reservoir work
- Wear gloves when working with nutrient solution for extended periods
First Aid
- Eye contact: Flush immediately with clean water for 15 minutes. Seek medical attention if irritation persists.
- Skin contact: Wash affected area with soap and water. Remove contaminated clothing.
- Ingestion: Do not induce vomiting. Contact Poison Control (1-800-222-1222) or seek immediate medical attention.
- Inhalation: Move to fresh air immediately. Seek medical attention if respiratory symptoms persist.
Refer to the Safety Data Sheet (SDS) for complete safety information.
COMPLETE YOUR SYSTEM
Micro Green 2-0-3 is the trace element foundation of a 4-part system. Each product in the system handles a distinct nutritional role — together they cover all 16 essential plant nutrients for every growth stage.
Cal-Mag Plus 2-0-0
Calcium and magnesium foundation — always added first to the reservoir. Prevents tip burn, blossom end rot, and chlorophyll deficiency.
Grow Green 4-2-6
Higher-nitrogen vegetative formula for weeks 1–8. Drives canopy development, stem thickness, and root establishment.
Blossom Green 2-6-8
High P-K bloom formula for weeks 9 through harvest. Supports flower formation, fruit set, and sugar accumulation.
4-Part Hydroponic Bundle
All four products together at a bundled price — the complete system from seedling to harvest, with no nutritional gaps.
FREQUENTLY ASKED QUESTIONS
Why is Micro Green added second, after Cal-Mag Plus?
Calcium and magnesium (from Cal-Mag Plus) need to be fully dissolved and diluted in the reservoir water before chelated minerals are introduced. Adding them together in concentrate form can cause the calcium to displace the chelate ligands, reducing the effectiveness of the EDTA protection and potentially causing localized precipitation. By adding Cal-Mag Plus first and letting it fully mix, you ensure the reservoir water is sufficiently diluted before the chelated micronutrients arrive.
Do I use the same rate of Micro Green during bloom as during veg?
Yes — with only minor reductions in the final flush stage. Unlike macronutrients (where nitrogen drops dramatically and phosphorus/potassium rise during bloom), micronutrient demand remains relatively consistent throughout a plant's life cycle. The feeding schedule holds Micro Green at 10 ml/gal from Early Vegetative through Peak Bloom, only dropping to 7.5 ml/gal during the Late Bloom/Flush stage. This consistency is one of the key advantages of a dedicated micronutrient product — you don't need to adjust it the way you manage your Grow Green to Blossom Green transition. For more on managing that transition, see our article on choosing the best hydroponic fertilizers.
Can I use Micro Green 2-0-3 with nutrients from other brands?
Micro Green is formulated specifically to complement Cal-Mag Plus, Grow Green, and Blossom Green as a matched system. Mixing with other manufacturers' base nutrients introduces unpredictable interactions — particularly around calcium and phosphate precipitation, pH stability, and EC calibration. The safest approach is to use the complete 4-part system together. If you're transitioning from another brand, we recommend doing a full reservoir flush and starting fresh with the complete system.
Why does my stock solution need to be stored in a dark container?
EDTA chelation works by forming a chemical ring structure around the metal ion that protects it from precipitating out of solution. UV and visible light can break these ring structures over time through a process called photodegradation — particularly for iron and copper chelates. Once the chelate is degraded, the free metal ion is far more likely to precipitate as a hydroxide or phosphate, especially as pH rises. A dark, opaque container prevents this and maintains stock solution quality for 6 months or more.
What are the signs of micronutrient deficiency in hydroponic plants?
The most reliable indicator is where on the plant the symptoms appear. Micronutrients that are immobile (iron, zinc, manganese, copper, boron) show deficiency on the youngest, newest growth first. Interveinal chlorosis on new leaves points to iron or manganese. Small, distorted new leaves suggest zinc. Hollow stems, poor pollination, or flower drop indicates boron. Molybdenum deficiency often resembles nitrogen deficiency because it impairs nitrate conversion — leaves yellow broadly even when nitrate EC is adequate. For an in-depth guide to reading these symptoms, see our article on essential micronutrients for plant health.
What is the role of calcium in Micro Green if Cal-Mag Plus already provides calcium?
The calcium in Micro Green (contributed by the calcium nitrate carrier) is supplementary — it adds to the calcium pool established by Cal-Mag Plus rather than replacing it. Cal-Mag Plus delivers the bulk of your calcium and magnesium requirements. The calcium in Micro Green is a natural result of using calcium nitrate as the nitrogen and carrier source — it's not a primary calcium delivery product. This is one of the reasons the mixing order matters: the larger calcium dose from Cal-Mag Plus must be introduced first and diluted before the smaller contributions from Micro Green are added.
GROW WITH CONFIDENCE
Product Quality Guaranteed
- Manufactured in California, USA
- CDFA registered — guaranteed analysis verified by the California Department of Food and Agriculture
- Independently tested by third-party laboratories for heavy metal content
- EDTA chelation verified for iron, zinc, manganese, and copper fractions
Hassle-Free Return Policy
90-day money-back guarantee. Return the unused portion in its original packaging for a full refund — no questions asked.
Environmental Responsibility
- Concentrated powder format minimizes packaging waste and shipping weight per nutrient delivered
- Precise chelated formulation reduces total micronutrient input compared to sulfate-form alternatives
- Biodegradable packaging
Charitable Contributions
1% of all profits go to our foundation, focused on improving educational opportunities for children.
DISCOVER MORE
- What Are the Best Fertilizers for Hydroponics? — Complete guide to building a reservoir nutrient program
- Beginner's Guide to Building a Hydroponic Garden — System types, setup, and first nutrients
- Essential Micronutrients for Healthier Plants — What each trace element does and how to spot deficiencies
- Improve Fruit Yield with Fertilizers — How micronutrients support flowering and fruiting stages
- What Is the Function of Potassium in Plants? — Why K matters from veg through harvest
HAVE QUESTIONS?
Check out our full FAQ page or contact our experts for personalized growing advice.
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