# Nutrient deficiency

> A nutrient deficiency is a shortage of an essential element in the plant tissue, causing characteristic symptoms; the cause is often pH or uptake rather than an empty feed.

- Canonical: https://genetixbay.com/knowledge/glossary/nutrient-deficiency.html
- Also written: deficiency, deficiencies, nutrient deficiencies, def, hunger sign
- Glossary category: Nutrients · Evidence: Established
- Status: Draft: awaiting expert review · Updated: 2026-10-31
- Licence: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0/), attribute "GenetixBay cannabis glossary"

A nutrient deficiency is a condition in which the plant contains too little of an essential element to function normally. It shows as specific symptoms: [chlorosis](https://genetixbay.com/knowledge/glossary/chlorosis.md), [necrosis](https://genetixbay.com/knowledge/glossary/necrosis.md), distortion, colour change or stunting, in a pattern that depends on the element and its mobility. Cockson and colleagues, and Llewellyn and colleagues, documented deficiency symptoms specifically in cannabis.

## In practice

Diagnose by location first: old leaves suggest a [mobile nutrient](https://genetixbay.com/knowledge/glossary/mobile-nutrient.md), new growth an immobile one. Then by pattern: uniform, interveinal, marginal or spotted. Before adding anything, check root-zone [pH](https://genetixbay.com/knowledge/glossary/ph.md), [EC](https://genetixbay.com/knowledge/glossary/ec.md) and runoff, because most "deficiencies" in practice come from [pH lockout](https://genetixbay.com/knowledge/glossary/nutrient-lockout.md), root damage, cold or [waterlogged](https://genetixbay.com/knowledge/glossary/overwatering.md) media, or antagonism from an excess of another element. A tissue test confirms what symptoms only suggest.

## Don't confuse with

- **Nutrient toxicity**: too much of an element, which can mimic a deficiency of another.
- **Pest damage**: mites, thrips and pathogens can cause spotting or distortion with no nutrient cause.
- **Natural senescence**: late-flower fade is expected.

## Myth check

"Add more nutrients" is rarely the first fix. Check pH and roots first. See [how to diagnose any problem](https://genetixbay.com/knowledge/diagnosis/how-to-diagnose-any-problem.md).

## Related terms

[Nutrient toxicity](https://genetixbay.com/knowledge/glossary/nutrient-toxicity.md), [Mobile nutrient](https://genetixbay.com/knowledge/glossary/mobile-nutrient.md), [Immobile nutrient](https://genetixbay.com/knowledge/glossary/immobile-nutrient.md), [Tissue test](https://genetixbay.com/knowledge/glossary/tissue-test.md), [Nutrient antagonism](https://genetixbay.com/knowledge/glossary/nutrient-antagonism.md)

## Read more

- [How to diagnose any cannabis plant problem](https://genetixbay.com/knowledge/diagnosis/how-to-diagnose-any-problem.md)
- [Mobile vs immobile nutrients: reading old vs new leaves](https://genetixbay.com/knowledge/nutrients/mobile-vs-immobile-nutrients.md)

## Sources

1. Cockson P, Landis H, Smith T, Hicks K, Whipker BE. 2019. Characterization of nutrient disorders of Cannabis sativa. Applied Sciences 9(20):4432. https://doi.org/10.3390/app9204432
2. Llewellyn D, Golem S, Jones AMP, Zheng Y. 2023. Foliar symptomology, nutrient content, yield, and secondary metabolite variability of cannabis grown hydroponically with different single-element nutrient deficiencies. Plants 12(3):422. https://doi.org/10.3390/plants12030422