Chelated Copper EDTA Fertilizer - 14% Cu
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Greenway Biotech · Made in California since 1989
Chelated Copper EDTA 14% Cu.
Copper that stays available.
A single-ingredient, 100% water-soluble chelated micronutrient that corrects copper deficiency where unchelated copper fails. The EDTA shell keeps copper plant-available across roughly pH 4 to 9 — useful in the high-pH soils where copper sulfate precipitates before reaching the root zone. CDFA registered and independently lab tested for heavy metals, with results consistently well below required limits.
Find your size → Calculate how much I need14%
Chelated copper (Cu) guaranteed analysis
4–9pH
Range across which EDTA keeps copper available
3–5×
Better absorption than copper sulfate in higher-pH soils
30+
Plant enzymes that depend on adequate copper
01 / Choose your size
Right-sized for the job.
Copper is a trace nutrient, so a little goes a long way. Coverage below is a planning reference at a mid-range broadcast rate of about 3 lbs per acre — your actual rate depends on a soil or tissue test. Hydroponic growers use far less per gallon; see the calculator for an exact dose.
| Bag Size | Soil Coverage (~3 lbs/acre) | Hydroponic Reservoir Volume | Best For |
|---|---|---|---|
| 1 lb | ~0.3 acre | Hundreds of reservoir refills | Home gardens, hydroponic growers |
| 5 lb | ~1.7 acres | Thousands of reservoir refills | Most popular |
| 10 lb | ~3.3 acres | Small commercial hydroponic systems | Serious growers and small farms |
| 25 lb | ~8 acres | Commercial hydroponic operations | Mid-size farms and orchards |
| 50 lb | ~16 acres | Large fertigation programs | Best value |
Bag sizes shown are a planning reference. Confirm the sizes currently offered against the product's variant options before ordering. Coverage figures assume a 3 lbs/acre broadcast rate; rates vary 2–5 lbs/acre by crop and soil test.
02 / Ideal applications
One product.
Every growing method.
Because it dissolves completely and stays chelated, this single copper source works across soil, foliar, drip, and hydroponic programs — correcting nutritional copper deficiency in each.
Field & Vegetable Crops
Broadcast or band into the root zone to correct documented copper deficiency. Typical soil rates run 2–4 lbs per acre, confirmed by soil test.
Foliar Spray
A fast route to correct active deficiency on new growth. Foliar rates are far lower than soil rates — spot-test first and avoid bloom on sensitive crops.
Trees & Vines
Apply to the soil under the canopy drip line, scaled by trunk diameter. Suited to orchard and vineyard copper-correction programs.
Hydroponics
Dosed to a target solution concentration of roughly 0.05–0.20 ppm Cu. Use the stock-solution method — dry quantities are too small to weigh per reservoir.
Drip Fertigation
Meters cleanly into drip, sprinkler, or furrow systems without clogging. Flush the line before and after injection and apply during active growth.
Not a Fungicide
This is a nutritional product for correcting copper deficiency. For algae control or Bordeaux mixture, use copper sulfate instead — chelated copper EDTA is not registered for pesticidal use.
03 / Why chelated copper EDTA
Unchelated copper
locks up. This doesn't.
In soils above pH 6.5, copper from sulfate sources reacts with carbonates and phosphates and precipitates out of reach. The EDTA cage is what keeps copper soluble and available to roots.
4–9pH
Stays available across a wide pH range.
EDTA forms a stable complex with the copper ion, protecting it from fixation by soil carbonates, phosphates, and organic matter. Copper sulfate begins to precipitate above roughly pH 6.5; chelated copper EDTA stays plant-available across roughly pH 4 to 9.
100%
Fully water-soluble, no residue.
Dissolves completely for soil drench, foliar spray, fertigation, and hydroponic use without clogging emitters or leaving sediment in the tank.
3–5×
More efficient uptake in higher-pH soils.
Because the chelate keeps copper from tying up, more of what you apply actually reaches the plant — which is why chelated copper is dosed at lower rates than copper sulfate. Compare the two forms in our guide to Sulfate vs Chelated Fertilizers.
30+
Feeds copper-dependent enzymes.
Copper is a cofactor for more than 30 plant enzymes involved in photosynthesis, respiration, lignin biosynthesis, and phenol metabolism. Because copper is immobile in plants, a steady root-zone supply matters most for new growth.
CDFA
Registered and lab tested.
Registered with the California Department of Food and Agriculture and manufactured at our Madera facility. Every batch is independently tested for heavy metals, with results consistently well below required limits.
04 / The science
Why copper, and why chelated.
Cu2+
Copper ion, held in an EDTA chelate complex
Copper is an essential micronutrient: plants need only small amounts, but they cannot complete their life cycle without it. It is central to plastocyanin, a protein in the photosynthetic electron transport chain, and to laccase enzymes that polymerize lignin — the structural polymer that stiffens cell walls. Because copper is immobile in plant tissue, deficiency shows first on the newest growth, often as pale young leaves, twisted shoots, and dieback of growing tips.
The challenge is soil chemistry. As an unchelated ion, copper readily reacts with carbonates, phosphates, and organic matter and precipitates into forms roots cannot absorb — a problem that worsens as soil pH rises above about 6.5. EDTA, a synthetic aminopolycarboxylic acid, wraps multiple binding sites around the copper ion to form a stable ring complex. That cage keeps the copper soluble and plant-available across roughly pH 4 to 9, releasing it in a controlled way at the root surface.
For the grower, that translates into predictable correction: lower application rates than copper sulfate, cleaner behavior in tank mixes and drip systems, and reliable performance in the high-pH soils where copper deficiency is most common. It is worth being precise about scope — chelated copper EDTA corrects a nutritional deficiency. It is not a fungicide or disease treatment, and copper's role in defense-related enzymes is a nutritional function, not a pesticidal claim.
For deeper coverage of the trace elements your soil may be missing, see our guide to Essential Micronutrients for Healthier Plants.
05 / Application rates
Pick your use.
Get your rate.
Rates below are drawn from the Brandt Sequestar 14% Cu specimen label — the most directly comparable 14% Cu-EDTA product — and university extension copper guidance. Always confirm with a soil or tissue test, and verify against your specific registered product label before applying.
06 / How to use & calculate
Test.
Dose.
Apply.
Copper correction is precise work — the gap between deficiency and toxicity is narrow. Confirm the need, calculate the amount, and apply by the most appropriate method.
-
01
Confirm the deficiency
Run a soil or tissue test before applying. Copper symptoms overlap with other micronutrient problems, and because copper accumulates in soil, applying it without a confirmed need risks long-term toxicity.
-
02
Calculate the amount
Use the calculator to convert your crop, area, or reservoir size into an exact amount. For hydroponics, make a stock solution first — dissolve 115 g in 1 gallon of water, then dose the concentrate.
-
03
Apply by the right method
Broadcast and incorporate for soil; spray buffered to pH 6–6.5 in early morning or evening for foliar; meter into the reservoir for hydroponics. Water soil applications in thoroughly.
-
04
Do not exceed label rates
Copper toxicity is difficult to reverse. Stay within label rates, keep total elemental copper near 2 lbs per acre per year, and retest before repeat applications.
07 / Compare
Two copper sources.
Different jobs.
Chelated copper EDTA and copper sulfate both supply copper, but they behave differently in soil and serve different purposes. For a full breakdown, see our guide to Sulfate vs Chelated Fertilizers.
| Product | Copper | pH Stability | Best For | Notes |
|---|---|---|---|---|
| Chelated Copper EDTA 14% (this product) | 14% Cu, chelated | Stable roughly pH 4–9 | Copper deficiency correction in neutral to alkaline soils, hydroponics, fertigation | Lower rates; clean in tank mixes; not a fungicide |
| Copper Sulfate Crystals | 25% Cu, unchelated | Best below pH 6.5; precipitates above it | Acidic-soil copper, algae control, Bordeaux mixture ingredient | Lower cost per lb; the appropriate choice for non-nutritional copper uses |
| Chelated Iron EDTA 13% | 13% Fe, chelated | Stable roughly pH 4–7 | Iron chlorosis — a different micronutrient deficiency | Pair with copper EDTA in a complete micronutrient program |
| Chelated Manganese EDTA | 13% Mn, chelated | Stable roughly pH 4–7 | Manganese deficiency, which often co-occurs with copper in organic soils | Tank-mix compatible with copper EDTA in dilute solution |
08 / Decision
Is this the right
copper source for you?
Chelated copper EDTA is built for nutritional copper correction. For acidic soils or non-nutritional copper uses, another product may serve you better.
Best Choice For
- Correcting confirmed copper deficiency in soils above pH 6.5
- Hydroponic and recirculating fertigation systems needing precise, clog-free dosing
- Active deficiency symptoms on new growth — chlorosis, twisted shoots, tip dieback
- A single copper source that works across soil, foliar, and drip programs
- Tank-mix programs where copper sulfate would precipitate
- Conventional, hydroponic, and integrated pest management operations
Consider Another Product If
- Your soil is consistently below pH 6.5 and you want a lower-cost copper source — try Copper Sulfate Crystals instead
- You need copper for algae control or Bordeaux mixture — use Copper Sulfate Crystals
- The deficiency you see is interveinal yellowing on new leaves — that points to iron; see Chelated Iron EDTA
- You are in certified organic production — EDTA is synthetic and not OMRI Listed; consult your certifier
- You manage land grazed by sheep — copper is highly toxic to sheep and copper inputs need careful siting
09 / Build the program
Copper is one piece.
These complete the program.
Copper deficiency rarely travels alone. These chelated micronutrients and trace elements round out a complete program for neutral to alkaline soils and hydroponic systems.
Chelated Iron
Chelated Iron EDTA 13%
Corrects iron chlorosis — interveinal yellowing on new growth. The most common micronutrient partner to copper.
Chelated ManganeseChelated Manganese EDTA
Supports photosynthesis enzymes and the water-splitting step of Photosystem II. Often deficient alongside copper in organic soils.
Chelated ZincChelated Zinc EDTA
Drives auxin production and protein synthesis. Prevents stunted growth and small leaves in corn, pecans, and citrus.
BoronBoric Acid 17% Boron
Essential for cell wall formation, pollination, and fruit set. Frequently deficient in sandy and alkaline soils.
10 / Safety & handling
Read this before
you apply.
Copper is highly toxic to sheep and accumulates in soil. Handle, site, and store this product with that in mind.
- Livestock: Copper is highly toxic to sheep even at moderate levels. Do not apply where sheep graze or where runoff may reach sheep pastures.
- PPE: Wear chemical-resistant gloves and safety goggles when handling dry powder or concentrated solutions; wear a NIOSH-approved dust mask when measuring in confined spaces.
- Storage: Store in the original sealed container in a cool, dry place. The product is hygroscopic and absorbs moisture from the air if exposed. Keep away from children, pets, and livestock.
- Compatibility: Jar-test before tank mixing. Do not mix with highly alkaline products (above pH 10) or high-calcium solutions, as these can destabilize the chelate.
- First aid: Flush eyes with water for 15 minutes; wash skin with soap and water; do not induce vomiting if swallowed — contact Poison Control at 1-800-222-1222. See the Safety Data Sheet for full guidance.
11 / FAQ
Common questions.
Honest answers.
If your question isn't here, contact our team at questions@greenwaybiotech.com.
What is chelated copper EDTA?
Chelated copper EDTA is copper bonded with EDTA (ethylenediaminetetraacetic acid), creating a protected form that remains available to plants across roughly pH 4 to 9. The chelation shell prevents copper from reacting with soil carbonates, phosphates, and organic matter, which can deliver 3 to 5 times more effective absorption than unchelated copper sulfate in higher-pH soils. For a deeper comparison, see our article on Sulfate vs Chelated Fertilizers.
How do I know if my plants need copper?
Copper is immobile in plants, so symptoms appear on new and young growth first while older leaves stay green. Look for young leaves turning pale green or yellow, twisted or malformed new growth, dieback of growing tips, weak stems, delayed maturity, and poor pollination or grain fill. Low soil-test values (around 0.2 ppm DTPA) or low tissue-test values can indicate deficiency. For a visual guide to identifying micronutrient problems, see our guide to Essential Micronutrients for Healthier Plants.
Why is EDTA chelation better than copper sulfate?
EDTA chelation holds copper plant-available across roughly pH 4 to 9, while copper sulfate can precipitate above pH 6.5. Chelated copper resists tie-up with phosphates and carbonates, can deliver 3 to 5 times better plant absorption in those conditions, maintains longer availability in the root zone, and offers good tank-mix compatibility. In acidic soils below pH 6.5, copper sulfate can still be an effective and lower-cost option.
What is the application rate for hydroponics?
Use the stock solution method: dissolve one half cup (about 115 grams) in 1 gallon of water to make a concentrate, then add one half to 1 teaspoon of that concentrate per 100 gallons of reservoir water to reach roughly 0.05 to 0.10 ppm copper. Direct weighing of dry powder is impractical because the amounts are very small. Confirm solution copper with a meter or test kit, and use the calculator on this page for an exact dose by reservoir size.
Can I mix Chelated Copper EDTA with other fertilizers?
In most cases yes. EDTA chelation makes this product compatible with many fertilizers. Always jar-test new combinations first. Fill the tank about two thirds with water, dissolve the copper EDTA first, then add other products. Avoid mixing with highly alkaline products (above pH 10) or high-calcium solutions, as these can destabilize the chelate, and avoid combining chelates with high-phosphate concentrates at stock strength.
Is this product safe for all livestock?
No. Copper is highly toxic to sheep. Do not apply in areas where sheep graze, and prevent runoff into sheep pastures. Cattle and other livestock have higher copper tolerance but should not have direct access to treated areas until the product is watered in and the area is dry.
Is Chelated Copper EDTA organic?
EDTA is a synthetic chelating agent, so this product is not OMRI Listed for certified organic production. For organic operations, consult your certifier about approved copper sources. This product is well suited to conventional, hydroponic, and integrated pest management programs.
What role does copper play in plant health?
Copper is essential for photosynthesis through the plastocyanin protein, for lignin biosynthesis that strengthens cell walls, for the activity of more than 30 copper-dependent enzymes, for pollen viability, and for defense-related enzymes. Even a mild copper deficiency can reduce crop quality and yield. Chelated Copper EDTA corrects nutritional copper deficiency; it is not a fungicide or disease treatment. Learn more in our article on 7 Ways Copper Sulfate Boosts Garden Health.
Ready to correct copper?
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Available in sizes from home-garden quantities to commercial bags, with free shipping on orders over $100. Every order is backed by our 90-day money-back guarantee — if it isn't right, return the unused portion for a full refund.
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