Browse Deficiencies
Browse Deficiencies
Browse Deficiencies

A copper deficiency in cannabis plants doesn’t happen too often. But when it occurs, it can negatively impact your harvest, since it stops the buds from maturing, when not fixed right away. While a copper deficiency due to a lack of copper in soil or water is possible, it is more likely caused by a pH problem at the roots of your plants that is restricting access to nutrients.

Our guide about copper deficiency can help you identify the signs of it early on, so you can fix it before more damage occurs. Even if you may not be able to save affected leaves that may have turned yellow because of a copper deficiency, your new growth will be fine. Most importantly, your cannabis plant will be able to flower and develop buds without a problem.

Copper Deficiency In Cannabis Plant


When there is a copper deficiency, the leaves of your plant turn dark with blue or purple undertones. As the leaves turn dark, the tips and edges of the leaves will turn a bright yellow or white. The leaves of your cannabis plant can also get a shiny, metallic appearance. Sometimes, the leaves can also roll under when they are affected. When your plants are already into flowering, a copper deficiency can severely affect bud growth. The buds ripen only very slowly or not at all.


Besides flushing your plants to restore the right pH level and a healthy root zone, you can do some additional things when you’re dealing with a copper deficiency. In gardening stores, you can find copper fungicides that contain copper sulphate and chelated copper. You can use these to give your plants copper right away. When you supply your plants with greensand, kelp and compost, it can help you with copper deficiencies as well.

Some growers treat a copper deficiency by soaking coins in water and then feeding the water to their plants. This works because some coins such as the 1p and 2p coins in the UK and dimes and quarters in the US are made almost entirely of copper. (Don’t use US pennies since pennies have more zinc than copper). Soak some coins in water over night and use the water on your plants if you’re in a pinch.

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