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Copper Deficiency
Problem: A cannabis copper deficiency is rare and manifests itself as leaves curling back, lack of growth, and unusual dark coloring of the leaves. Copper doesn't move easily through the plant and is considered "low-mobile."
Symptoms of New (Young) Leaves
- Dark or twisted
- Purple or blue undertones
- Metallic sheen on leaves
- Leaves turn under
- Tips may turn yellow or white
Symptoms of Older Leaves
- Older leaves may show signs of pale yellow or white
Other Copper Deficiency Symptoms
- Buds do not ripen, or grow very slowly
- Pistils (hairs) on female plants may not grow properly
- Plant may wilt or have limp leaves
- New growth has difficulty opening up
It is very unlikely that there is no copper available in your water or soil, so usually a copper deficiency in cannabis is caused by a pH problem at the roots that is restricting access to nutrients.
Often it is a problem with another nutrient or with the pH that causes the appearance of a copper deficiency.
Copper toxicity (too much copper) in cannabis plants is rare, though a severe case of too much copper can cause a quick death to the plant.
Solution For Cannabis Copper Deficiency
If you suspect your growing cannabis plant has a copper deficiency, flush your system with clean, pH'd water that contains a regular dose of cannabis-friendly nutrients. This will remove any nutrient salts that may be affected the uptake of copper and help restore pH to the proper levels..
Watch to make sure that the problem starts to clear up within a couple of days. Old growth may not recover, but new growth should be healthy.
- In soil, copper is best absorbed by the roots in the 6.0 - 7.0 pH range
- In hydro, copper is best absorbed by the roots in the 5.5 - 6.5 pH range
If you cannot get rid of a cannabis copper deficiency, please consult our 6-Step Cure to 99% of Cannabis Growing Problems
