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.
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.
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.
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.
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.
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.
Registered with the California Department of Food and Agriculture, meaning the guaranteed analysis on every label is independently verified for accuracy and compliance.
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.
Independently lab tested for heavy metal content, providing confidence for both food crops and medicinal plants where contamination standards are strict.
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.
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.
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.
EDTA-protected iron for chlorophyll synthesis and photosynthesis. Stays soluble at typical reservoir pH of 5.5–6.5.
EDTA-protected zinc for protein synthesis, auxin regulation, and cold-stress tolerance. Prevents small-leaf and stunting symptoms.
EDTA-protected manganese for photosystem II function and enzyme activation. Interveinal chlorosis on newer leaves is the classic deficiency sign.
EDTA-protected copper for lignin synthesis, stem strength, and reproductive processes including flower and seed formation.
Water-soluble boron source for cell wall integrity, pollen viability, sugar transport, and carbohydrate metabolism. Not chelated — ionic borate is directly available.
Highly soluble molybdenum source for nitrate reductase enzyme function — essential for converting nitrate into usable amino acids and proteins.
Contributes the 2% nitrogen and provides the calcium fraction in the formula. Calcium supports cell wall integrity in developing leaves and roots.
Supplies the 3% potassium in the formula with a sulfate carrier — a clean, chloride-free potassium source suited for sensitive crops.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
| 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) |
| 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 |
| 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 |
| 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 |
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.
Refer to the Safety Data Sheet (SDS) for complete safety information.
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.
Calcium and magnesium foundation — always added first to the reservoir. Prevents tip burn, blossom end rot, and chlorophyll deficiency.
Higher-nitrogen vegetative formula for weeks 1–8. Drives canopy development, stem thickness, and root establishment.
High P-K bloom formula for weeks 9 through harvest. Supports flower formation, fruit set, and sugar accumulation.
All four products together at a bundled price — the complete system from seedling to harvest, with no nutritional gaps.
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.
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.
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.
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.
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.
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.
90-day money-back guarantee. Return the unused portion in its original packaging for a full refund — no questions asked.
1% of all profits go to our foundation, focused on improving educational opportunities for children.
Check out our full FAQ page or contact our experts for personalized growing advice.
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