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Bat Guano Fertilizer for Weed: An Organic Superfood

By Dagga Seeds Dec11,2023

When it comes to cultivating healthy and high-quality cannabis plants, providing them with the right nutrients is essential. While the natural nutrients present in the soil play a significant role, supplementing with external sources can greatly enhance plant growth and yields. One such source of nutrients that has gained popularity in the cannabis industry is bat guano fertilizer. Known for its organic composition and nutrient richness, bat guano has been hailed as a superfood for cannabis plants. In this comprehensive guide, we will explore the benefits, uses, and application methods of bat guano fertilizer for weed.


What is Bat Guano Fertilizer?

Bat guano fertilizer is derived from the harvested and treated excrements of bats. These furry creatures, known for their social nature, form large colonies that inhabit the same cave for generations. Over time, the excrement accumulates on the cave floor, creating compost-like dunes. This organic matter, known as guano, is a rich source of essential plant nutrients, including nitrogen, phosphorus, and potassium. Additionally, bat guano contains a range of micronutrients that contribute to overall plant health and development.

The Importance of Nitrogen, Phosphorus, and Potassium

Nitrogen, phosphorus, and potassium, commonly referred to as NPK, are three key nutrients required by cannabis plants for optimal growth and development. Each nutrient plays a vital role in different stages of the plant’s life cycle. Understanding the significance of these nutrients will help you harness the full potential of bat guano fertilizer for your cannabis plants.

  1. Nitrogen (N): Nitrogen is crucial for promoting vigorous vegetative growth. It is responsible for the lush green foliage of plants and plays a vital role in various physiological processes, including photosynthesis and nucleic acid formation.
  2. Phosphorus (P): Phosphorus is essential for healthy flowering and root development. It aids in the production of robust buds and flowers, contributing to overall plant productivity and quality.
  3. Potassium (K): Potassium is involved in several plant functions, including nutrient absorption, water regulation, and disease resistance. It promotes sturdy plant structures and helps plants withstand environmental stressors.

Bat Guano and the Cannabis Growth Phases

One of the remarkable aspects of bat guano fertilizer is its suitability for both the vegetative and flowering stages of cannabis plants. The nutrient composition of bat guano can vary depending on the type of bats and their diet. This variation allows growers to choose specific bat guano fertilizers tailored to each growth phase.

  1. Vegetative Stage: During the vegetative stage, cannabis plants require higher levels of nitrogen to support leafy growth and establish a strong foundation. Bat guano derived from insect-eating bats, which has a high nitrogen content, is ideal for this phase. It provides the necessary nutrients for robust vegetative growth, ensuring healthy and vibrant plants.
  2. Flowering Stage: As cannabis plants transition into the flowering stage, they have an increased demand for phosphorus to support bud formation and flower development. Bat guano sourced from fruit-eating bats, which contains higher levels of phosphorus, is beneficial during this phase. It helps enhance flower production, resulting in bigger and healthier buds.

The Benefits of Bat Guano Fertilizer for Cannabis Cultivation

Using bat guano fertilizer offers numerous advantages for cannabis cultivation. Its organic composition and nutrient-rich profile contribute to the overall health and productivity of plants. Let’s explore some of the key benefits of incorporating bat guano into your cannabis growing regimen:

Soil Improvement:

Bat guano helps improve soil texture by binding loose soil particles and increasing water retention. It loosens dense soil, allowing for better water penetration and oxygen diffusion, essential for root health and nutrient uptake.

pH Adjustment:

Bat guano acts as a natural pH adjuster, helping maintain optimal soil pH levels for cannabis plants. This ensures proper nutrient absorption and prevents nutrient deficiencies or toxicities.

Nutrient Supply:

The high nutrient content of bat guano, including nitrogen, phosphorus, and potassium, provides a steady and balanced supply of essential macronutrients throughout the plant’s life cycle. This slow-release mechanism prevents nutrient burn and toxicity, promoting healthy and sustained growth.

Microbial Activity:

Bat guano contains beneficial microorganisms that contribute to the overall health of the soil and plants. These microorganisms aid in the breakdown of organic matter, nutrient cycling, and disease suppression, creating a thriving soil ecosystem.

Disease Resistance:

The presence of beneficial microorganisms in bat guano helps protect cannabis plants from pests and diseases. It strengthens the plant’s natural defense mechanisms, making them more resilient to external stressors.

Terpene Profile Enhancement:

Bat guano has been known to enhance the terpene profile of cannabis plants during the flowering phase. Terpenes play a crucial role in the aroma and flavor of cannabis, and bat guano can contribute to a more robust and long-lasting terpene profile.

Micronutrient Supply:

In addition to macronutrients, bat guano provides a range of essential micronutrients such as boron, calcium, iron, manganese, sulfur, zinc, and magnesium. These micronutrients are vital for various physiological functions, including enzyme activation, chlorophyll production, and root health.

By harnessing the benefits of bat guano fertilizer, cannabis growers can optimize plant growth, improve yields, and produce high-quality, organic marijuana.

Using Bat Guano Fertilizer for Weed: Application Methods

Bat guano fertilizer can be applied through various methods, depending on your preference and growing setup. Here are some popular application methods for incorporating bat guano into your cannabis cultivation:


1. Soil Mixing Recipe

For a balanced soil mix, use the following ratios:

  1. Base Soil: Begin with a high-quality potting mix or soil.
  2. Bat Guano: Add bat guano at a ratio of 1 cup per cubic foot of soil for a general-purpose mix.
  3. Additional Amendments: Enhance the mix with perlite (1:1 ratio with the base soil) for aeration and vermiculite (1/2 cup per cubic foot) for water retention.
  4. Final Blend: Mix thoroughly, ensuring even distribution.
  5. Rest Period: Allow the soil mix to sit for a week, promoting the breakdown of guano by microorganisms for optimal nutrient availability.

This versatile blend provides a nutrient-rich, well-balanced soil for various cannabis strains. Adjust quantities based on specific plant needs and growth phases. Top dress soil with Bat Guano during peak flowering periods.

2. Guano Tea

Creating a guano tea is a convenient method to provide plants with a nutrient-rich solution. Follow these steps to prepare a guano tea:

  1. Dissolve a specified amount of bat guano in warm, chlorine-free water. The recommended dosage is typically 1 tablespoon of guano per liter of water.
  2. Stir the mixture thoroughly to ensure proper dissolution of the guano.
  3. Let the guano tea sit overnight to allow the nutrients to infuse into the water.
  4. Use the guano tea to water your plants once a week, ensuring they receive the necessary nutrients for healthy growth.

3. Direct Soil Application

For a more straightforward approach, bat guano can be applied directly to the soil around the base of the plants. This method is ideal for established plants or outdoor cultivation. Follow these steps for direct soil application:

  1. Dig a shallow ring around the base of the plant, approximately 5cm away from the stem.
  2. Sprinkle a specified amount of bat guano, typically 2 heaped tablespoons, within the ring.
  3. Cover the guano with soil and, if desired, apply a layer of mulch to retain moisture and suppress weed growth.
  4. Water the soil thoroughly to activate the guano and facilitate nutrient absorption.

4. Compost Tea

Compost Tea Bucket Setup

Bat guano can be incorporated into a nutrient-rich compost tea to boost microbial activity and enhance the soil food web. To create a compost tea using bat guano:

  1. Fill a large bucket with non-chlorinated water.
  2. Add fully finished compost, blackstrap molasses, and a specified amount of bat guano to the water.
  3. Stir the mixture thoroughly to ensure proper blending of ingredients.
  4. Place an air stone in the bucket to aerate the solution for 48 hours, allowing beneficial microbes to colonize and multiply.
  5. Dilute the compost tea with water at a ratio of 1 part tea to 10 parts water.
  6. Apply the compost tea as a foliar spray or soil drench to enhance the soil food web and promote flower production.

Precautions and Considerations

While bat guano fertilizer offers numerous benefits, it’s important to exercise caution and follow proper guidelines for safe and effective use:

  1. Protection: When handling bat guano, always wear protective gear such as masks and gloves to avoid inhaling fungal spores or coming into direct contact with the fertilizer.
  2. Dosage: Follow the recommended dosage guidelines provided by the manufacturer to prevent nutrient burn or toxicity. Over-application of bat guano can have adverse effects on plant health.
  3. Storage: Store bat guano fertilizer in a cool, dry place away from direct sunlight and cold floors to maintain its efficacy and prevent moisture absorption.
  4. Testing: Conduct periodic soil testing to monitor nutrient levels and ensure a balanced nutrient profile. This will help you make informed adjustments to your fertilization regimen.

By adhering to these precautions and considerations, you can maximize the benefits of bat guano fertilizer while ensuring the health and vitality of your cannabis plants.


Bat guano fertilizer has a long history as an organic superfood for plant growth, and its benefits extend to cannabis cultivation. With its rich nutrient composition, slow-release mechanism, and microbial advantages, bat guano offers a natural and effective solution for promoting healthy and high-yielding cannabis plants. Whether you choose to mix it into the soil, prepare guano tea, or apply it directly, the versatility of bat guano fertilizer allows for seamless integration into your cannabis growing regimen. Embrace the power of nature and harness the potential of bat guano for optimal growth and bountiful harvests.

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