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Copper Deficiency
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A cannabis copper deficiency is characterized by dark leaves with blue or purple undertones. The tips and edges of the leaves turn pale yellow or white, creating a stark contrast with the rest of the darkened foliage. In addition, the affected leaves may exhibit a shiny or metallic sheen, feel stiff, and start turning under. This deficiency tends to affect the leaves directly under the grow lights.
Cause of Issue
◉ The main cause of a cannabis copper deficiency is an incorrect pH at the plant's roots, which restricts the availability of nutrients. Copper tends to become locked at certain pH levels, and the plant absorbs it more effectively in a slightly acidic root environment. It is unlikely that there is a complete absence of copper in the water or soil.
Symptoms
◉ Leaves turn dark with blue or purple undertones.
◉ Tips and edges of leaves turn bright yellow or white.
◉ Leaves may have a shiny or metallic sheen and feel stiff.
◉ Leaves may start turning under.
◉ Affected leaves are often directly under the grow lights.
◉ Buds may not ripen or grow slowly.
Corrective Actions
◉ Adjust pH to the Correct Range:
Ensure that the pH at the plant's roots is within the appropriate range. In soil, copper is best absorbed in the pH range of 6.0-7.0, while in hydroponic systems, the range is 5.5-6.5. Flushing the system with clean, pH-adjusted water containing cannabis-friendly nutrients can help remove any nutrient salts affecting copper uptake and restore pH levels.
◉ Provide the Right Nutrients:
Most cannabis growers do not need to add additional copper to address a deficiency since it is already present in tap water and cannabis-friendly nutrients. Excessive filtration or the use of reverse osmosis (RO) water may remove copper, making deficiencies more likely. However, pH issues are a more common cause of copper deficiencies.
◉ Maintain Healthy Roots:
Proper care of the plant's roots is crucial to prevent or address copper deficiencies. Avoid overwatering and ensure good drainage to prevent root problems.
◉ Monitor Leaf Recovery:
After taking the necessary steps, observe the affected leaves for signs of improvement within a few days to a week. While damaged leaves may not regain their full green color, the absence of new symptoms on emerging leaves indicates that the deficiency has been addressed. Remember to regularly monitor and adjust the pH of the root environment to prevent future nutrient deficiencies.
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