Best Fertilizers and Nutrients for Growing Cannabis

There are many states in the US which now approve legal growing of marijuana. This means that there are now more marijuana growers than ever. One thing that most growers need to know is that cannabis plants need boosters i.e. fertilizers in order to thrive. For new as well as veteran cannabis growers, this article offers a review of the best fertilizers for growing cannabis.

What do Cannabis Plants Need?

Cannabis plants need the right type of fertilizers and nutrients in order to produce high yields. If you want them to grow huge and produce large buds, then you have to fertilize them. These fertilizers can be commercial which you can purchase in local stores. Additionally, you can opt to make your own organic fertilizers. or opt in for organic cannabis.

The Best Fertilizers for Growing Cannabis

Cannabis plants produce high yields when they are in the right growing medium. And to create a medium that will lead to optimum growth, you need to ensure that the growing medium contains fertilizer. Some of the best fertilizers for growing cannabis plants include:Best Fertilizers for Growing Cannabis

Vermiculite and Perlite

The Vermiculite and perlite are sterile inorganic products which function and appear differently. Vermiculite has a tan or brown color. Its PH is almost neutral and it absorbs water. On the other hand, Perlite has a white appearance and its PH is slightly alkaline. However, both of them are normally used interchangeably and people often purchase them together. Vermiculite and Perlite help to prevent the soil from hardening when it dries up.

It’s important to note that both Vermiculite and Perlite help to nourish plants. They contain minerals such as potassium, magnesium, and calcium which cannabis needs in order to grow. If you have a hydroponics system for your pot plants, you can create a fertilizer which has 50 percent of this combination. However, if you are growing these plants in your garden, then you need to only add 10 percent of vermiculite and perlite to your fertilizer.

Wood Ashes

This is another great type of fertilizer that can enhance the growth of cannabis plants.  Wood ashes contain high amounts of lime and potassium which these plants need. All you have to do is to scatter the ashes on the plants or add them to your compost heap. Some of the best trees for wood ashes are hardwoods such as oak and maple.

Note: wood ash is also an effective pesticide. You can use to protect your plants from snails and slugs. When you are applying wood ash, the environment needs to be dry. This is because when the ash becomes wet, it produces high amounts of lye and salt.


This is a ready-made gardening fertilizer with a great track record. Miracle-Gro is a 15-30-15 fertilizer which is made up of 15 percent nitrogen, 30 percent phosphorus, and 15 percent potassium. It’s a product that is already engineered and all you have to do is to apply it per the directions. Miracle-Gro is an instant worker that contains all the essential nutrients which cannabis plants need to thrive.

Marijuana Booster Fertilizers

Marijuana is like all other plants, they need nutrients to thrive. If you want them to produce large flowers, then you need to supply them with all the essential nutrients. Plants use photosynthesis to make different nutrients. However, they need an external supply of nutrients for optimum growth. Marijuana booster fertilizers are great additions. They will facilitate better and healthy growth of these plants.  The booster fertilizers will lead to the development of large buds which are rich in THC content.

Carbon-Dioxide Generators

Everyone knows that plants need carbon dioxide in order to grow. They breathe in CO2 and breathe out oxygen.  On the other hand, human beings exhale CO2 and inhale oxygen. This creates a symbiotic relationship between plants and human beings. However, the amount of CO2 is sometimes not enough. In order to accelerate the growth of marijuana, it’s sometimes important to increase the supply of CO2. It’s at this point that a grower may introduce carbon-dioxide generators.

Vinegar-Baking Soda CO2 Generator

This is a simple way of generating carbon dioxide. Vinegar-baking Soda combination involves droplets of white vinegar and a reasonable amount of baking powder. Allow the vinegar to slowly drip into a bowl of baking soda, at the rate of about one drop for every two minutes. The chemical reactions when these two substances combine lead to the production of high amounts of carbon dioxide. Most people who grow cannabis indoors or in the closet usually set up this generator like an intravenous drip

CO2 “Bomb”

This involves the use of a generator to supply your marijuana with CO2. CO2 “Bomb” creates an atmosphere which has high carbon dioxide content. The generation of this gas is usually done in completely closed or small enclosed spaces so as to prevent this gas from eloping.

CO2 “Bomb” can also be done locally. Simply cover the whole plant with a large plastic back. Then place a small jar that’s filled up to a quarter level with baking powder. To ensure that the plant has sufficient supply of CO2, it should be right below the plastic bag and the jar should be open.  Add about a tablespoon of vinegar into the jar. This will create a foam and enhance the formation of CO2.  After that, seal the lower side of the plastic bag to form a tent. Let the plant breath for 10-15 minutes and then add more vinegar. Don’t forget to stir this mixture so that more CO2 can be generated. Seal it again and then leave it for a couple of hours.

Human Urine

Human urine is also a great fertilizer. Although this may appear weird, urine is an effective fertilizer for marijuana plants. Plants need nitrogen for healthy growth. Nitrogen is a nutrient that helps to boost the growth of stems and leaves. During the summer months, cannabis growers need to ensure that the plants have an adequate supply of nitrogen because this is when growth is critical. Fresh human urine contains high nitrogen content. However, you should not urinate directly on your plants. This could lead to their death because the urine content depends on your diet. Urine has high salt content hence you should dilute one part of urine with 10 parts of water.

Note: only use urine as a source of nutrients to your cannabis if you are healthy. If you are suffering from urinary tract infection or you are under medication, avoid using your urine. You might end up infecting your plants and even possibly kill them.


Gardeners with experience definitely know that all organic matter eventually turns into soil. These materials normally take all the nutrients which are found in the original matter. So, if you want to create fertile gardening soil then it’s vital for you to create a compost pit to create waste organic materials.

Compost will boost the growth of your cannabis plants. It enriches the soil with a wide range of nutrients. Some of the waste products that you can throw in the pit include food remains, bone meal, worm castings, and chicken manure. Once you have a heap, use a pitchfork to turn the compost almost every day. You need to thoroughly mix all the contents of the heap. This is important for better and quick decomposition of the organic materials. Note that a compost heap needs around three months for it to be effective and usable.

Note apart from the compost heap, you can also create a compost tea. This is a liquid version of the solid compost heap. To create compost tea, you need water, organic compost organic molasses, and other extra materials.

When Should Fertilizing Stop?

Cannabis plants need different types of nutrients at different stages of growth. So, you can create a feed chart which can help you know when to stop fertilizing. It’s also important not to overfeed your plants with nutrients and you can flush overfed plants with a PH neutral water. However, do not carry out the flushing process a week prior to forcing your plants into flowering.  You should stop fertilizing your plants when the leaves turn yellow or appear burnt if the harvesting period is not close. This could be because of nitrogen burn.

Note that your plants can also suffer from nutrient deficiencies. So, always keep an eye on them. Generally, cannabis plants need just a few nutrients. Do not forget to flush your plants at around two weeks before harvesting period. Failure to do this means that your marijuana could pick the taste of the fertilizer.

Final Thoughts

Fertilizers, whether commercial or homemade are essential for the growth of marijuana. Cannabis plants need nutrients in order to thrive and produce an optimal harvest. However, ensure that you do not overfeed them as this will create unwanted side effects. Additionally, a deficiency in nutrients will lead to low yields. Just make sure that the supply is moderate.



By Felix Wood

Many readers find issues about Marijuana, and they believe that it is a rich source of THC. They are also associate the Name with racism. Felix Wood understands all this clearly, and he writes informative content explaining why THC is like a hemp plant. Felix learned many things about herbal medicine. It is through his academics that he started developing an interest in CBD products. If you need real insights into Marijuana. Be sure to find all this from Felix's work. He has written many eBooks, articles, and magazines about marijuana. He even works in a CBD company that uses Marijuana to make CBD products. Felix enjoys doing exercises because he values fitness and wellness.

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