What are the advantages of Bat Guano fertilizer for cannabis?


Cannabis, like all other plants, requires the presence of sufficient nutrients, macro or micro, to grow optimally and healthily. In addition to the natural nutrients contained in the soil, external sources of nutrient supply have proven useful for plant sustenance and health.

Therefore, it becomes imperative for a farmer to purchase additional nutrients or supplements that facilitate plant processes and boost harvests. Fertilizers are one of the main sources of nutrients. Their use is not limited to the cultivation of cannabis; they are used to grow all kinds of crops. We are going to explore a particular type of fertilizer.

Why is bat guano fertilizer so good for cannabis?

Bat guano is the harvested and processed bat droppings used as fertilizer in the cultivation of plants and, by extension, cannabis plants. The fame associated with the use of bat guanos in the cannabis industry stems from their richness in nitrogen, phosphorus and potassium.

You might be wondering why there is so much hype surrounding these three compounds. These compounds are essential nutrients for the healthy development of cannabis plants.

The link between bat guanos and the growth phases of the cannabis plant

Their suitability and suitability for maximizing the two main phases of cannabis plants have fueled praise for them. Bat guanos can be used in the vegetative and budding phases of a cannabis plant’s life cycle, depending on the type purchased. This implies that some brands offer bat guanos compatible with the vegetative phase, while others offer guanos compatible with the flowering phase.

For the former, the NPK ratio is usually between 8-1-1 and 7-3-1. The latter only boasts of a phosphorus dominance of 10 to 12%. According to Herbies, guanos like this are produced by fruit bats. It is important to note that phosphorus is essential during the flowering stage as it triggers the emergence of larger buds and healthy flowers.

Main forms in which they appear

Usually, bat guano is packaged as granules or powder. It is then up to the grower to choose their preferred application method. Often, growers who purchase powdered guanos dissolve them in chlorine-free water before infusing them into the soil, either before planting or during growth.

Growers have admitted that they prefer this method because it allows plant roots to seep deep into nutrients. Another way to use powdered guanos is to incorporate them into aerated compost extracts prior to soil application.

Benefits of bat guanos in cannabis cultivation

The fact that several wars have been fought to claim territories rich in this organic substance indicates its many advantages, which will be discussed in this section. Here are the benefits of using long-lasting bat guano for growing cannabis

1. Supply of essential nutrients

Bat guano is known to possess macro-elements that a plant cannot do without. The three main constituents of this organic fertilizer are nitrogen, phosphorus and potassium. Nitrogen is the chemical compound that makes plants greener and healthier by facilitating vital plant processes like photosynthesis.

Thus, a fair amount of this compound is needed during the vegetative phase of cannabis plants as they sprout their leaves during this time. Moreover, nitrogen is responsible for maintaining the genetic integrity of a plant since it constitutes an important part of nucleic acids.

On the other hand, phosphorus is beneficial in producing strong and healthy buds, which makes every grower happy. They are also known to improve the terpene profile of plants, a factor that most users consider before buying cannabis.

According to Herbies, plants with enough potassium have greater resistance to pests and diseases, which can reduce the quality of your yields. Potassium also facilitates the continuous circulation of liquid matter throughout the plant.

2. Improving soil texture and adjusting pH

Who would believe that bat poop could fix your soil texture deficiencies? Yes, you heard right. Bat dung has been shown to be effective in loosening dense soil. And the power of this activity usually manifests itself in a soil that is easily permeated by water since its pores are not clogged with water. In addition, this process allows the smooth diffusion of oxygen, which is essential for the life of a plant because its lack triggers the plant to wilt or die at worst.

Additionally, bat guano is effective in creating an optimal soil pH which increases the rate of nutrient uptake. Therefore, plants are not nutritionally deficient due to starvation.

3. Presence of beneficial microbes

Another benefit of using bat guano is its multiple microbial benefits. And these benefits can manifest themselves in many forms. One of the main benefits of the presence of microorganisms in bat dung is that it rids the soil of pollutants and contaminants that can leach into the plant. And it becomes very toxic to human body when ingested.

Also, it increases the rate of saprophytic activities in plants. Therefore, the plants have more nutrients broken down by the fungi to feed on.


Although there are several benefits to using bat guano in growing cannabis plants, growers are advised to use them in moderation. Indeed, using more than necessary can cause nutrient burn, which alters the appearance of cannabis plants and affects the quality of their yields.

Additionally, when handling bat droppings, growers are advised to take precautionary measures such as the use of masks and gloves. Refusal to use protection can cause histoplasmosis, a serious condition affecting the airways when an individual inhales fungal spores found in bat droppings.


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