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=== Fan leaf colour ===
The color and general appearance of [[Anatomy_of_Cannabis#Fan_leaves|fan leaves]] can provide a lot of information about issues involving nutrients. If the colour is uneven it can be a sign of poor health.
[[File:
▲[[File:Leaf_colour_nutrients.jpg|600px|center|alt=|Fan leaf patterns for diagnosing nutrient issues]]
Leaves that are a shade of very dark green can be a sign of nitrogen toxicity.
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