Copper (Cu) Deficiency

Copper (Cu) Deficiency

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Scientific Name
Copper (Cu)
Atomic Number
29
Atomic Weight u
63.546
Elemental Group
Micro elements (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) | Micronutrients
Available Forms

Available forms of Copper (Cu) for Horticultural Production

  • Copper sulfate (CuSO₄·5H₂O, “Bluestone”) – soluble; foliar or drench source at low, safe rates.
  • Copper chelate (Cu-EDTA, “EDTA-Cu”) – soluble and safer for fertigation; good foliar uptake.
  • Copper oxychloride (3Cu(OH)₂·CuCl₂, “Copper oxychloride”) – primarily used as a fungicide; provides some nutritional Cu.
  • Copper hydroxide (Cu(OH)₂, “Copper hydroxide”) – foliar source with added disease control benefit.
  • Copper lignosulfonate (varied composition, “Copper lignosulfonate”) – organic complex; used in soil or media application.
  • Copper nitrate (Cu(NO₃)₂·3H₂O, “Copper nitrate”) – soluble source included in some fertilizer formulations.
  • Copper oxide (CuO, “Copper oxide”) – slow-release, low-solubility Cu source for blends.
  • Copper frits (varied composition, “Slow-release Cu frits”) – controlled-release Cu for container substrates.

Copper (Cu) Deficiency

Container Nursery Stock, Pot & Bedding Plants

Symptoms

  • Young shoots show dieback, twisting, and failure of growing tips.
  • Leaves may appear dark, dull, or bluish-green before developing interveinal chlorosis and marginal necrosis.
  • Short internodes cause rosetting; stems may be brittle.
  • Reduced flowering and increased susceptibility to disease are common.

Causes

  • High substrate pH or over-liming reduces Cu availability.
  • High organic matter or fresh bark in mixes ties up copper.
  • Excessive phosphorus (P), zinc (Zn), or iron (Fe) fertilization interferes with uptake.
  • Poor root health from overwatering, low aeration, or pathogens limits absorption.

Correction

  • Apply copper chelates as foliar sprays at low, safe rates to avoid phytotoxicity.
  • Drench with copper chelates or dilute copper sulfate to restore root-zone Cu.
  • Adjust substrate pH to 5.5–6.0 and rebalance nutrient programs high in P, Zn, or Fe.
  • Improve aeration and drainage; manage root pathogens effectively.

Prevention

  • Maintain substrate pH at 5.5–6.0; avoid excessive liming.
  • Incorporate trace element packages with sufficient copper in regular fertilization.
  • Avoid over-application of P, Fe, or Zn that antagonize Cu uptake.
  • Maintain good drainage, aeration, and sanitation to ensure healthy roots.
  • Use routine media and tissue testing to monitor early Cu trends.

Copper (Cu) Deficiency

Copper (Cu)
Scientific Name
Copper (Cu)
Atomic Number
29
Atomic Weight u
63.546
Elemental Group
Micro elements (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) | Micronutrients
Available Forms

Available forms of Copper (Cu) for Horticultural Production

  • Copper sulfate (CuSO₄·5H₂O, “Bluestone”) – soluble; foliar or drench source at low, safe rates.
  • Copper chelate (Cu-EDTA, “EDTA-Cu”) – soluble and safer for fertigation; good foliar uptake.
  • Copper oxychloride (3Cu(OH)₂·CuCl₂, “Copper oxychloride”) – primarily used as a fungicide; provides some nutritional Cu.
  • Copper hydroxide (Cu(OH)₂, “Copper hydroxide”) – foliar source with added disease control benefit.
  • Copper lignosulfonate (varied composition, “Copper lignosulfonate”) – organic complex; used in soil or media application.
  • Copper nitrate (Cu(NO₃)₂·3H₂O, “Copper nitrate”) – soluble source included in some fertilizer formulations.
  • Copper oxide (CuO, “Copper oxide”) – slow-release, low-solubility Cu source for blends.
  • Copper frits (varied composition, “Slow-release Cu frits”) – controlled-release Cu for container substrates.
Copper (Cu) Deficiency
Image Source: Everris Research (NL), care of ICL

Copper (Cu) Deficiency

Container Nursery Stock, Pot & Bedding Plants

Symptoms

  • Young shoots show dieback, twisting, and failure of growing tips.
  • Leaves may appear dark, dull, or bluish-green before developing interveinal chlorosis and marginal necrosis.
  • Short internodes cause rosetting; stems may be brittle.
  • Reduced flowering and increased susceptibility to disease are common.

Causes

  • High substrate pH or over-liming reduces Cu availability.
  • High organic matter or fresh bark in mixes ties up copper.
  • Excessive phosphorus (P), zinc (Zn), or iron (Fe) fertilization interferes with uptake.
  • Poor root health from overwatering, low aeration, or pathogens limits absorption.

Correction

  • Apply copper chelates as foliar sprays at low, safe rates to avoid phytotoxicity.
  • Drench with copper chelates or dilute copper sulfate to restore root-zone Cu.
  • Adjust substrate pH to 5.5–6.0 and rebalance nutrient programs high in P, Zn, or Fe.
  • Improve aeration and drainage; manage root pathogens effectively.

Prevention

  • Maintain substrate pH at 5.5–6.0; avoid excessive liming.
  • Incorporate trace element packages with sufficient copper in regular fertilization.
  • Avoid over-application of P, Fe, or Zn that antagonize Cu uptake.
  • Maintain good drainage, aeration, and sanitation to ensure healthy roots.
  • Use routine media and tissue testing to monitor early Cu trends.