Leaf Health & Deficiencies
Chlorosis
Chlorosis is the yellowing of plant leaves caused by reduced chlorophyll production. In cannabis cultivation, it often signals nutrient deficiencies or root zone imbalances.
This page may contain affiliate links. Learn more.
What Chlorosis Is
Chlorosis is a physiological condition in which cannabis leaves lose their green coloration due to decreased chlorophyll levels. Chlorophyll is essential for photosynthesis, and its reduction limits the plant’s ability to convert light into energy, directly affecting growth and vigor.
How Chlorosis Appears on Cannabis Leaves
In cannabis plants, chlorosis commonly appears as yellowing between leaf veins or across entire leaves, depending on the underlying cause. The pattern of discoloration often helps identify whether the issue is related to mobile or immobile nutrient deficiencies. For example, nitrogen deficiency typically begins in older leaves, while iron deficiency often appears in newer growth.
Nutrient Imbalances That Cause Chlorosis
Nutrient imbalance is one of the most frequent causes of chlorosis. Deficiencies in nitrogen, magnesium, iron, or other micronutrients can disrupt chlorophyll production. However, chlorosis may also occur when nutrients are present but unavailable due to pH imbalance or nutrient lockout in the root zone.
Environmental Stress and Chlorosis
Environmental stress can contribute to chlorosis as well. Overwatering, poor drainage, inadequate aeration, and root damage may impair nutrient uptake, indirectly leading to yellowing. Light stress or temperature extremes can also affect chlorophyll stability and leaf coloration.
Diagnosing the Cause of Chlorosis
Proper diagnosis requires evaluating feeding practices, pH levels, runoff readings, and environmental conditions. Correcting the underlying imbalance typically restores normal leaf coloration in new growth, though severely affected leaves may not fully recover.
Why Early Correction of Chlorosis Is Important
In cannabis cultivation, chlorosis is a visible indicator of underlying nutrient or environmental issues. Early identification and corrective action help protect photosynthetic capacity and maintain steady plant development throughout the growth cycle.
Related terms:
Nutrient Deficiency, Nitrogen Deficiency, Iron Deficiency, pH Imbalance, Nutrient Lockout, Root Zone, Leaf Symptom, Nutrient Uptake
Stay informed as the site grows.
If you’d like to be notified when new glossary terms or educational resources are added, you can join the mailing list below.
We send emails occasionally and only when there’s something genuinely useful to share.