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Usually, growers only know a plant is in ill health because it looks different. There are many visual signs that can be used to
Most abnormalities in leaf color can be found in this article. This covers nutrient deficiencies and toxicities. If your plant shows other signs of damage it may be the work of [[Pests and insects|Insects or other pests]].
== By Leaf appearance==
=== Fan leaf
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 color is uneven it can be a sign of poor health.<div align='center'>
<ul>
<li style="display: inline-block;"> [[File:Deficiency and
<li style="display: inline-block;">[[File:Whole plant nutrient deficiencies and excesses.jpeg|thumb|600px]] </li>
<li style="display: inline-block;"> [[File:Nutrient_Disorder_visual_guide.jpg|thumb|none|600px]]</li>
<li style="display: inline-block;"> [[File:Deficiencies on fan leaves.png|center|thumb|600px]]</li>
=== Wilted leaves ===
This can be a sign of both under and over
=== Claw fan leaves ===
The apex of the leaf clawing down
[[File:Leaf claw2.jpg|alt=|left|thumb]]
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