Cannabis Nutrition: What are Micronutrients

Although also essential in a cannabis plant’s life cycle, micronutrients are used in lower amounts.
09 June 2020
3 min read
Cannabis Nutrition: What are Micronutrients

  • 1. What are micronutrients?
  • 2. Micronutrients
  • 2. a. Boron (b)
  • 2. b. Chlorine (cl)
  • 2. c. Copper (cu)
  • 2. d. Iron (fe)
  • 2. e. Manganese (mn)
  • 2. f. Molybdenum (mo)
  • 2. g. Zinc (zn)
  • 3. Recommended amounts of micronutrients
  • 4. Overfeeding and underfeeding
  • 5. In conclusion

These nutrients, also known as “trace elements” because of the very small amount of them needed, are essential to the cannabis plant’s growth, just like macronutrients.

And although the amount needed can be 10x lower (or more) than macronutrients, they are crucial in the plant’s development.

1. What Are Micronutrients?

Micronutrients are the minerals essential for plant growth used in lower quantities. Even though they're needed up to 10x less than macro, micronutrients can also cause symptoms associated to nutrient deficiencies and are extremely important for a plant to grow healthy and produce dense buds.

Micronutrients can be found in tap water. So depending on your source of water, you won’t need to add them individually. Although there’s no way to know exactly unless you measure it with a Total Dissolved Solids (TDS) meter. They are vital for a cannabis plant although they are needed in lower amounts than macronutrients.

Their role is to “support” macronutrients in achieving the needed structure and preparing the plant to successfully go through the flowering stage

Note: Filtering the water removes every mineral in it, so you will need to add micronutrients to top your feeding solution.

2. Micronutrients

Trace elements are a group of minerals that are needed in almost untraceable amounts. The most common ones are a group of more than 20 and have different roles in a plant’s life cycle. They are:

Boron (B)

In combination with Calcium, Boron is essential in the flowering stage, responsible for the division of cells and an important element in the structure of cell walls.

Chlorine (Cl)

Chlorine is needed in very small amounts and is responsible not only for helping in the opening and closing of the plant’s pores (allowing her to “breath”) it helps the plant to keep the leaves firm and strong.

Copper (Cu)

Copper works as an activator of enzymes. It helps speed up photosynthesis and supports the vascular tissue of cannabis plants.


Micronutrients are as essential as macronutrients, with the small difference of them being needed in lesser amounts.

Iron (Fe)

This mineral is not only responsible for producing energy but it’s also a component in the production of chlorophyll, giving the plant that rich green color.

Manganese (Mn)

Manganese is directly related to the health of your plant. This mineral help fight off disease by protecting roots against pathogens and helps with the absorption of nitrogen.

Molybdenum (Mo)

Molybdenum is used in very tiny quantities and it helps in the formation of proteins.

Zinc (Zn)

Zinc is also needed in tiny amounts but is very important to cannabis. This mineral helps in the building of growth hormones and is connected to the space between internodes.

3. Recommended Amounts Of Micronutrients 

Although they’re needed in super small amounts, the lack of any of these nutrients can cause severe deficiencies and growth problems.


Recommended amounts of micronutrients for vegetative and flowering stages.

Note: These numbers represent the ppm value for all the cannabis life cycle and should be adjusted according to the signs your plant gives.

4. Overfeeding and Underfeeding

Even though micronutrients are needed in lower amounts, not providing or providing too much of them can cause deficiencies, just like with macronutrients. This is because even though they’re less used, they’re also vital for cannabis plants and they directly support macronutrients in their processes.

It is essential you are aware of which minerals are present in your feeding solution and the amount they’re in.

TDS meter used for measuring the particles per million (PPM) of a nutrient solution.

You should measure your solution and add the missing minerals if you want to grow a 100% healthy plant.

5. In Conclusion

Even though they’re called “micro”, they are just as important as macronutrientsEvery grower must make sure their plants receive every mineral they need to grow happy and healthy.

Providing only macronutrients without controlling the micronutrients will result in a weak plant, more susceptible to bugs and pests.

If you want to grow a plant to its full potential, you should provide the proper mix of both micro and macro nutrients.

09 June 2020