Lack of iron in the cannabis growing

Written by on 6 December, 2020

Cannabis plants need various nutrients and micronutrients to grow healthy and develop properly, so it is very important to ensure that you provide a balanced diet, and act immediately if you detect any deficiency or excess of them.

In this opportunity, we want to talk to you about the iron deficiencies in the cannabis growing, so we invite you to continue reading this post.

Iron in marijuana

The iron is very important for the plants of cannabis. Among other things, this element contributes to the breathing of marijuana, it is fundamental for the enzymatic function and the production of chlorophyll, and much more.


This disadvantage usually occurs when the soil pH is above 6.5, and can occur when plants are over-watered and when there are low temperatures or high humidity in the root system.

Likewise, it can occur due to an excess of light intensity, or an excess of microelements that produce a lack of them and other reasons.

It is necessary to keep in mind that the most vulnerable substrate is the coconut; however, this can also occur in hydroponic growing and in soil.


Cannabis plants tend to give certain signs when something is not right, however, you need to keep in mind that it is not very easy to detect this deficiency because often the symptoms are confused with the lack of other nutrients such as calcium or magnesium. Anyway, it is ideal that you examine the plants from top to bottom, to try to identify the problem well.

The iron deficiency will be visible in the upper parts of the plant. This problem affects the youngest and tallest leaves, unlike magnesium deficiency, which is associated with the presence of yellow leaves in the lower or middle region of the plant.

In this case the young leaves and new shoots will suffer a green/yellow chlorosis, while the veins or nerves of the leaves remain green.

A continuous lack can turn the leaves white. In severe cases, the leaves can even show necrosis. Among other symptoms.

Final considerations

Try to keep all factors such as temperature, humidity, food, watering, lighting, oxygenation and ventilation at optimal levels, also make sure your plants have good drainage. Remember that every detail can make the difference between a good or bad harvest.

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