Micro Green 2-0-3
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Greenway Biotech · Made in California since 1989
Micro Green 2-0-3.
Seven trace elements. Every stage.
The micronutrient foundation of our 4-part hydroponic system. EDTA-chelated iron, zinc, manganese, and copper stay soluble across the 5.5–6.5 reservoir pH range — with boron, molybdenum, and calcium completing the seven-element profile. CDFA registered and third-party lab tested.
Find your size → Calculate how much I need7elements
Complete trace profile in one powder
4chelated
Fe, Zn, Mn, Cu EDTA-protected
1.5lb/gal
Stock solution mixing ratio
6+months
Stock solution shelf life in the dark
01 / Choose your size
Right-sized for your reservoir.
Every bag mixes at the same 1.5 lbs per gallon of water to make stock solution. Pick the size that matches your reservoir volume and how often you change it.
| Bag Size | Stock Solution Yield | Reservoir Coverage | Best For |
|---|---|---|---|
| 1.5 lb | 1 gallon stock | ~380 reservoir-gallons at peak bloom | Hobbyist tents, single-reservoir grows |
| 3 lb | 2 gallons stock | ~760 reservoir-gallons at peak bloom | Most popular Home growers running a full cycle |
| 7.5 lb | 5 gallons stock | ~1,900 reservoir-gallons at peak bloom | Greenhouse and small commercial |
| 15 lb | 10 gallons stock | ~3,800 reservoir-gallons at peak bloom | Best value Commercial recirculating systems |
02 / Ideal applications
One formula.
Six different systems.
Wherever soil microbes aren't releasing trace elements naturally, Micro Green fills the gap — inert media, recirculating water, or soilless mixes.
DWC & RDWC
Continuous-feed reservoirs where chelated micros maintain availability across the weekly cycle without precipitating out.
Coco Coir
Coco's high cation exchange capacity locks up zinc and iron quickly — Micro Green at every feed can help support uptake.
NFT & Ebb-and-Flow
Thin-film and flood systems benefit from the consistent chelated availability across stages, holding through the weekly reservoir.
Aeroponics
Fine-mist absorption is high — run at ~75% concentration to avoid leaf concentration and root salt accumulation.
Foliar Spray
Targeted application at 2.5–5 ml/gal can help with rapid recovery from visible deficiencies on young leaves.
Soilless Mixes
Peat, perlite, and rockwool media supply almost no native micronutrients — Micro Green is the safe baseline.
03 / Why Micro Green
Seven elements.
Engineered to stay available.
Hydroponic and soilless media demand more than NPK. The most common reservoir problems — interveinal chlorosis, weak new growth, poor fruit set — trace back to micronutrient gaps that EDTA chelation is designed to address.
7elements
Complete trace profile in one powder.
Boron, iron, zinc, calcium, manganese, copper, and molybdenum — the seven trace elements most commonly limiting in reservoir-grown plants — in one concentrated formula. No juggling seven separate micronutrient supplements, no risk of leaving one out.
EDTA
Four metals stay soluble across reservoir pH.
Iron, zinc, manganese, and copper are EDTA-chelated — the chelate ring holds the metal in solution at the 5.5–6.5 pH range where unchelated forms would precipitate as hydroxides or phosphates. This is why Micro Green can run continuously in a recirculating reservoir without lockout. For more on chelated versus sulfate forms, see Sulfate vs Chelated Fertilizers.
Everystage
One rate, seedling to flush.
Unlike macronutrients that shift dramatically from veg to bloom, micronutrient demand stays roughly constant through the cycle. Micro Green holds at 10 ml/gal from early veg through peak bloom and only steps down to 7.5 ml/gal during late bloom flush — one less variable to track.
CDFA
Guaranteed analysis verified by the state.
Registered with the California Department of Food and Agriculture, meaning every label percentage is independently verified for accuracy and compliance — not a marketing claim. Independently lab tested for heavy metal content, with results consistently well below required limits.
4-part
Built to integrate with the rest of the program.
Formulated to drop into the same reservoir as Cal-Mag Plus 2-0-0, Grow Green 4-2-6, and Blossom Green 2-6-8 — each product handles a distinct nutritional role with no overlap.
$/lb
Concentrated powder, not water weight.
Powder form eliminates the cost of shipping water — one 1.5 lb bag makes a full gallon of stock concentrate. The bag covers approximately 380 reservoir-gallons at peak bloom dosing.
04 / The science
Why chelation matters in a reservoir.
5.5–6.5reservoir pH
The window where EDTA holds Fe, Zn, Mn, Cu in solution
In an unchelated nutrient solution, iron, zinc, manganese, and copper are highly reactive. As pH drifts above 6.0 — which happens routinely in recirculating reservoirs as plants take up nitrate — these metals form insoluble hydroxides and phosphates that drop out of solution. Once precipitated, they're effectively invisible to the root system. Plants will show the classic interveinal chlorosis even though the metals are still physically present in the reservoir.
EDTA chelation works by wrapping a synthetic ligand around the metal ion, forming a stable ring structure that prevents it from reacting with hydroxide, phosphate, or carbonate. The chelated metal remains dissolved across the 5.5–6.5 reservoir pH range and stays available for root uptake. Boron and molybdenum behave differently — their ionic forms (borate and molybdate) are naturally stable across this pH range, so chelation isn't required.
The practical implication: a Micro Green stock solution stored in a dark container will hold its full micronutrient availability for six months or more. UV and visible light can break the chelate ring through photodegradation, which is why the bottle goes in a cabinet, not on a windowsill.
For deeper coverage of the seven trace elements and what each one does, see Essential Micronutrients for Healthier Plants.
05 / Application rates
Pick your stage.
Get your rate.
All rates are ml of Micro Green stock solution per gallon of finished reservoir water. Stock solution is prepared at 1.5 lbs of powder per gallon of water.
Complete 4-Part System Feeding Schedule
Quick answer: 10 ml of Micro Green stock per gallon from early veg through peak bloom; 7.5 ml/gal during the final flush.
| 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 |
|---|---|---|---|---|---|---|
| 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 |
Mixing order matters: Cal-Mag Plus first → Micro Green second → Grow Green or Blossom Green third → adjust pH last. Never combine concentrates directly — always add each one to a reservoir already filled with water.
Hydroponic System Guidelines
Quick answer: Most systems run continuously at the 4-part schedule rate; reduce to ~75% for aeroponics.
| System Type | Feed Schedule | Special Notes | Reservoir Change |
|---|---|---|---|
| DWC/RDWC | Continuous | Monitor pH daily — iron chelate is most sensitive to drift | Weekly |
| NFT | Continuous | Check EC twice daily; thin film accelerates evaporation | Weekly |
| Ebb & Flow | 2–4× daily | Adjust concentration for flood frequency | Weekly |
| Drip / Drain-to-Waste | Multiple daily | Maintain 10–20% runoff for salt prevention | N/A |
| Coco Coir | 1–2× daily | Never allow to dry; coco has high cation exchange capacity | N/A |
| Aeroponics | 15-min cycles | Use ~75% concentration; fine mist increases absorption | Weekly |
Soil & Container Drench
Quick answer: 5–10 ml of Micro Green stock solution per gallon of water, applied to pre-moistened soil weekly.
| Application Method | Rate (stock solution) | Frequency | Notes |
|---|---|---|---|
| Soil Drench | 5–10 ml/gal | Weekly | Apply to pre-moistened soil to avoid runoff |
| Fertigation (drip) | 5–10 ml/gal | With each watering | Through drip or overhead irrigation |
| Container plants | 5 ml/gal | Bi-weekly | Reduce frequency in winter or dormant periods |
Note: Micro Green is optimized for inert and soilless media. Rich living soils with active microbial populations typically release adequate trace elements on their own — if you're growing in well-amended garden soil, a targeted single-element correction (e.g., Chelated Iron EDTA) may be more appropriate than a complete micro blend.
Foliar Application for Deficiency Correction
Quick answer: 2.5–5 ml of stock solution per gallon, applied in early morning or evening every 5–7 days until symptoms resolve.
| Use Case | Rate (stock solution) | Frequency | Notes |
|---|---|---|---|
| Routine maintenance | 2.5 ml/gal | Bi-weekly | Spray undersides as well as tops of leaves |
| Visible deficiency correction | 5 ml/gal | Every 5–7 days | Continue until new growth comes in clean, then revert to reservoir dosing |
Foliar safety check: Foliar rates should always be well below soil rates — typically 1–4 g/gallon (or 2–6 g/liter) depending on crop. Test on a small leaf area first, spray in early morning or late afternoon, and avoid spraying at temperatures above 85°F. Allow foliage to dry before lights-on in indoor grows.
06 / How to use & calculate
Mix.
Pour.
Adjust.
Make stock once, dose every reservoir fill. The calculator on the right runs your numbers for any stage and reservoir size, and recommends the bag that fits.
-
01
Make stock solution once.
Dissolve 1.5 lbs of Micro Green powder into 1 gallon of clean room-temperature water (RO or low-EC preferred). Stir until fully dissolved. Let stand 30 minutes for chelate bonds to stabilize.
-
02
Store in the dark.
Transfer to a dark, opaque container with a tight-fitting lid. Label with the date. The stock solution is stable for 6+ months when kept out of light — UV breaks the EDTA chelate ring.
-
03
Add to the reservoir — second in line.
Fill the reservoir with water first. Add Cal-Mag Plus first and let it dissolve. Add Micro Green second at the stage-appropriate rate. Then Grow Green or Blossom Green. Adjust pH to 5.5–6.5 last.
-
04
For deficiency correction: foliar spray.
Mix 2.5–5 ml of stock solution per gallon of water in a sprayer. Apply in early morning or evening. Spray undersides of leaves as well as tops. Repeat every 5–7 days until symptoms resolve, then return to reservoir dosing only.
07 / Compare
Complete vs.
single-element.
Micro Green covers the full trace profile. The individual chelated and mineral products below are for targeted correction when a soil or tissue test points to a single-element deficiency.
| Product | Elements Covered | Form | Best For | Notes |
|---|---|---|---|---|
| Micro Green 2-0-3 (this product) | All 7 trace elements | EDTA chelate + mineral powder | Hydroponic, coco, soilless — ongoing reservoir feeding | One product covers the full trace profile |
| Chelated Iron EDTA 13% | Iron only | EDTA chelate powder | Targeted iron deficiency in pH-stable systems | For acute interveinal chlorosis on new growth |
| Chelated Iron DTPA 11% | Iron only | DTPA chelate powder | Iron correction at higher pH (up to ~7.0) | More stable than EDTA above pH 6.5 |
| Chelated Zinc EDTA | Zinc only | EDTA chelate powder | Coco-grown crops with documented Zn deficiency | Small, distorted new leaves are the classic Zn symptom |
| Chelated Manganese EDTA | Manganese only | EDTA chelate powder | Targeted Mn correction in alkaline media | Interveinal chlorosis on newer leaves |
| Boric Acid 17% B | Boron only | Mineral powder | Pre-bloom boron supplementation | Boron toxicity comes quickly — test first |
08 / Decision
Is Micro Green right
for your system?
Built for inert media and recirculating water. Less essential where rich living soil is already releasing micros naturally.
Best Choice For
- Any hydroponic, coco, or soilless system needing a complete trace profile
- Growers already running Cal-Mag Plus, Grow Green, or Blossom Green who want a matched system
- Reservoir-grown plants showing interveinal chlorosis, stunted new growth, or weak flowering
- Coco coir grows where high cation exchange capacity locks up zinc and iron quickly
- Greenhouse and commercial operations wanting one product instead of seven separate supplements
- Growers who want chelated micros that stay available across the 5.5–6.5 reservoir pH range
Consider Another Product If
- You have a single-element deficiency confirmed by a soil or tissue test — try Chelated Iron EDTA or the relevant single chelate instead
- You're growing in rich living soil — native microbial activity typically releases adequate trace elements
- Your system runs consistently above pH 7 — consider Chelated Iron DTPA 11% for the iron fraction
- You need pre-bloom boron specifically — Boric Acid 17% B at lower cost per element
- You want the complete 4-part system at a bundled price — check the 4-Part Hydroponic Bundle
09 / Build the program
Four products.
One complete system.
Each member of the 4-part system handles a distinct nutritional role — together they cover every essential plant nutrient for every growth stage.
Calcium + Mg
Cal-Mag Plus 2-0-0
The reservoir foundation — always added first. Calcium and magnesium can support cell wall integrity and chlorophyll production.
Veg N-P-KGrow Green 4-2-6
Higher-nitrogen vegetative formula for weeks 1–8. Drives canopy, stem thickness, and root establishment.
Bloom P-KBlossom Green 2-6-8
High P-K bloom formula for weeks 9 through harvest. Supports flower formation, fruit set, and sugar accumulation.
Best Value4-Part Hydroponic Bundle
All four products together at a bundled price — the complete program from seedling to harvest with no gaps.
10 / Safety & handling
Read this before
you mix.
Concentrated chelated minerals can irritate skin and eyes. Powder dust can irritate eyes and the respiratory tract. Standard horticultural PPE applies.
- PPE: Wear gloves and eye protection when measuring or mixing powder. Use a dust mask in poorly ventilated spaces. Wash hands thoroughly with soap and water after handling.
- Storage: Keep the powder in its sealed original container in a cool, dry location away from direct sunlight. Store stock solution in a dark, opaque container — UV breaks the EDTA chelate. Keep out of reach of children and pets.
- Application: Always add to reservoir water — never mix concentrates directly together. Follow the mixing order: Cal-Mag Plus first, Micro Green second, Grow or Blossom Green third. Do not exceed recommended rates — copper and zinc can reach phytotoxic levels at high concentrations.
- Compatibility: Use only with the Greenway 4-part system. Mixing with concentrated calcium fertilizers from other brands can cause precipitation. Jar-test any unfamiliar combination before adding to the main reservoir.
- First aid: Eye contact — flush with clean water for 15 minutes; seek medical attention if irritation persists. Skin contact — wash with soap and water; remove contaminated clothing. Ingestion — do not induce vomiting; contact Poison Control (1-800-222-1222). Inhalation — move to fresh air; seek medical attention if symptoms persist. Refer to the SDS for complete safety information.
11 / FAQ
Common questions.
Honest answers.
If your question isn't here, contact our team at questions@greenwaybiotech.com.
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 before chelated micronutrients arrive. Adding them together in concentrate form can let calcium displace EDTA ligands, reducing chelate effectiveness and potentially causing localized precipitation. Adding Cal-Mag first and letting it mix ensures the water is sufficiently diluted before Micro Green goes in.
Do I use the same rate of Micro Green during bloom as during veg?
Yes — with only minor reductions in the final flush. Unlike macronutrients (nitrogen drops sharply, phosphorus and potassium rise during bloom), micronutrient demand stays roughly constant. The feeding schedule holds Micro Green at 10 ml/gal from early vegetative through peak bloom and only drops to 7.5 ml/gal during late bloom flush.
This consistency is one of the main advantages of a dedicated micronutrient product — you don't have to manage it the way you manage the Grow Green to Blossom Green transition. For more on the macro side of that transition, see choosing the best hydroponic fertilizers.
Can I use Micro Green with nutrients from other brands?
Micro Green is formulated to complement Cal-Mag Plus, Grow Green, and Blossom Green as a matched system. Mixing with another manufacturer's base nutrients introduces unpredictable interactions — particularly around calcium and phosphate precipitation, pH stability, and EC calibration. The safest approach is to run the complete 4-part system. If you're transitioning from another brand, we recommend a full reservoir flush before starting.
Why does my stock solution need to be in a dark container?
EDTA chelation works by forming a chemical ring around the metal ion that prevents it from precipitating. UV and visible light can break those rings through photodegradation — especially 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 as pH rises. A dark, opaque container prevents this and maintains stock solution quality for six 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. Immobile micronutrients (iron, zinc, manganese, copper, boron) show deficiency on the youngest 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 looks like 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 Essential Micronutrients for Healthier Plants.
What role does the calcium in Micro Green play if Cal-Mag Plus already supplies calcium?
The calcium contributed by Micro Green (from 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 calcium and magnesium. The smaller calcium contribution in Micro Green is a natural result of using calcium nitrate as the nitrogen carrier, not a primary calcium delivery product. This is part of why the mixing order matters: the larger Cal-Mag Plus dose goes in first and dilutes before the smaller Micro Green contribution arrives.
Can I use Micro Green for foliar spray, and at what rate?
Yes. Mix 2.5–5 ml of stock solution per gallon of clean water. Apply in early morning or evening — avoid spraying in temperatures above 85°F to prevent leaf burn. Spray the undersides of leaves as well as the tops; stomatal absorption is highest on the underside. Allow foliage to dry before lights-on in indoor grows. Repeat every 5–7 days until deficiency symptoms resolve, then return to reservoir dosing only.
Why is there no phosphorus in Micro Green?
By design. Phosphorus and calcium can precipitate as insoluble calcium phosphate in concentrated stock solutions. Keeping Micro Green phosphorus-free prevents compatibility issues when mixing in sequence with Cal-Mag Plus. Phosphorus comes from Grow Green (2%) and Blossom Green (6%) at the appropriate stage of the feeding schedule.
How long does a Micro Green bag last?
At peak bloom dosing (10 ml of stock per gallon of reservoir water), one gallon of stock solution covers approximately 380 gallons of finished nutrient solution. A 1.5 lb bag yields one gallon of stock; a 3 lb bag yields two gallons; a 7.5 lb bag yields five gallons; and a 15 lb bag yields ten gallons. The calculator above will compute exact coverage for your reservoir size, growth stage, and weekly reservoir change frequency.
Ready to feed?
Pick your bag. We'll ship it.
Available in 1.5 lb, 3 lb, 7.5 lb, and 15 lb sizes — from hobbyist reservoirs to commercial recirculating systems. Free shipping on orders over $100. Backed by our 90-day money-back guarantee on the unused portion.
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