How To Make Compost Tea For Cannabis | Vancouver Seed Bank

How To Make Compost Tea For Cannabis

Cannabis Compost Tea

To guarantee strong plant health and optimal production, growing cannabis requires a sophisticated strategy. Cannabis compost tea is a natural and sustainable way to feed cannabis plants among the many growth techniques available. Cultivators may maximize soil fertility, encourage good microbial activity, and realize the full potential of their cannabis garden by being aware of the subtleties of cannabis compost tea.

Compost tea serves as a potent elixir for cannabis plants, enriched with essential nutrients, beneficial microbes, and organic matter. Unlike synthetic fertilizers, which can disrupt soil ecology and harm plant health in the long run, compost tea fosters a harmonious relationship between soil, microorganisms, and plants. By harnessing the power of compost tea, cultivators can cultivate cannabis in an environmentally friendly and sustainable manner.

Table Of Contents

Understanding What Is Compost Tea

Benefits of Compost Tea

When To Use Compost Tea?

Cannabis Compost Tea Recipe At Home

Is Compost Tea Weed Safe?


Frequently Asked Questions

Understanding What Is Compost Tea

cannabis compost tea

Compost tea is a liquid fertilizer brewed by steeping compost in water. It harnesses the beneficial microorganisms and nutrients present in compost to create a potent plant tonic. The brewing process involves aerating the mixture to promote microbial growth and enhance nutrient availability. 

Compost tea acts as a natural soil conditioner, enriching the soil with essential nutrients and organic matter. It promotes healthy plant growth, improves soil structure, and suppresses pathogens, contributing to overall soil and plant health. Compost tea is a sustainable and environmentally friendly solution for enhancing plant vitality and supporting robust agricultural practices.

Benefits of Compost Tea

Compost tea is a natural fertilizer that offers numerous benefits to gardeners and plant enthusiasts. Rich in nutrients and beneficial microorganisms, compost tea promotes healthy soil and robust plant growth.

One of the key advantages of compost tea for weed is its ability to enhance soil structure, improving water retention and aeration. This leads to healthier root systems and better nutrient uptake by plants. Additionally, the diverse array of microorganisms present in compost tea helps suppress harmful pathogens and pests, reducing the need for chemical pesticides.

Moreover, compost tea aids in the decomposition of organic matter, enriching the soil with essential nutrients like nitrogen, phosphorus, and potassium. This not only fosters healthier plant growth but also contributes to soil fertility and overall ecosystem health.

Furthermore, compost tea is cost-effective and environmentally friendly, providing an organic alternative to synthetic fertilizers that can harm the environment and contaminate water sources.

When To Use Compost Tea?

Compost tea is best used during the growing season, particularly when plants are actively growing and in need of nutrients. It can be applied as a foliar spray or soil drench every 2-4 weeks, depending on plant needs and soil conditions. Apply compost tea in the early morning or late afternoon to avoid direct sunlight, which can kill beneficial microorganisms. 

Avoid using compost tea during extreme weather conditions, such as heavy rain or drought, to ensure optimal absorption by plants. Overall, incorporating compost tea into regular watering routines can promote healthier plants and improve soil fertility throughout the growing season.

Cannabis Compost Tea Recipe At Home

cannabis compost tea

Materials Needed:

To make compost tea at home, you’ll need the following materials:

  • Compost: High-quality compost rich in organic matter is the foundation of compost tea. You can either purchase compost or create your own using kitchen scraps, yard waste, and other organic materials.
  • Water: Use chlorine-free water, such as rainwater or dechlorinated tap water, to prevent harm to beneficial microorganisms.
  • Aeration Device: Aeration is crucial for fostering the growth of beneficial aerobic microorganisms. You can use an aquarium air pump or create a DIY bubbler system.
  • Container: Choose a non-reactive container, such as a bucket or a large drum, to brew the compost tea.
  • Strainer: To remove solid particles and debris from the finished compost tea, a strainer or cheesecloth is necessary.

Brewing Compost Tea:

Follow these steps to brew compost tea at home:

  • Fill your container with water, leaving enough space to accommodate the compost and allow for aeration.
  • Add compost to the water at a ratio of approximately 1 part compost to 5-10 parts water. The exact ratio may vary based on the strength of your compost and the desired potency of the tea.
  • Stir the mixture thoroughly to ensure the compost is fully immersed in water.
  • Install the aeration device in the container to oxygenate the tea. Proper aeration encourages the growth of beneficial aerobic microorganisms while inhibiting the proliferation of harmful anaerobic organisms.
  • Allow the compost tea to brew for 24 to 48 hours, maintaining aeration throughout the process.
  • After brewing, strain the compost tea to remove any solids, yielding a liquid fertilizer ready for application.


Compost tea can be applied to plants in various ways:\

  • Foliar Spray: Use a spray bottle to apply compost tea directly to the leaves of plants. This method delivers nutrients and beneficial microbes directly to the foliage, promoting nutrient uptake and enhancing disease resistance.
  • Soil Drench: Pour compost tea directly onto the soil around the base of plants. This method enriches the soil with nutrients and microbes, improving soil structure and fertility.
  • Root Drench: When transplanting or establishing new plants, soak the roots in compost tea before planting. This helps inoculate the root zone with beneficial microorganisms, promoting healthy root development.

Is Compost Tea Weed Safe?

Yes, compost tea is generally safe to use when made properly. When brewed correctly with high-quality compost and clean water, compost tea is rich in beneficial microorganisms and nutrients that promote plant growth and soil health. However, improper brewing or contamination can lead to the growth of harmful pathogens, so it’s essential to follow proper brewing and application practices. Additionally, using compost tea from trusted sources and avoiding raw manure can minimize the risk of contamination. Overall, when used responsibly, compost tea is a safe and sustainable option for fertilizing plants and improving soil quality.


Compost tea is a cost-effective and eco-friendly way to boost the health and vitality of your plants, including cannabis. Making compost tea at home is a simple yet effective way to nourish your plants and improve soil health. By harnessing the power of compost and beneficial microorganisms, you can create a nutrient-rich tonic that enhances plant growth and vitality. Incorporate compost tea into your gardening routine to cultivate thriving gardens and lush landscapes, all while minimizing environmental impact and promoting sustainability.

Frequently Asked Questions 

1. How often should I apply compost tea to my cannabis plants?

The amount of compost tea applied on a regular basis can vary based on plant growth stage, soil type, and environmental conditions. Generally speaking, during the growth season, pouring compost tea every one to two weeks can help keep plants healthy and vigorous.

2. Can compost tea be used as a foliar spray for cannabis?

Yes, compost tea can be applied as a foliar spray to cannabis plants. Foliar spraying with compost tea can deliver nutrients and beneficial microbes directly to the leaves, promoting nutrient uptake and enhancing plant defense mechanisms against pests and diseases.

3. Can I brew compost tea indoors?

Compost tea can be brewed indoors using a suitable container, high-quality compost, and clean water. However, proper aeration is crucial to ensure the growth of beneficial aerobic microorganisms and prevent the proliferation of harmful pathogens.

4. Can compost tea help improve soil quality for cannabis cultivation?

Compost tea does, in fact, help cultivate cannabis by enhancing the soil with nutrients, organic matter, and healthy microbes. Applying compost tea on a regular basis can improve the fertility, soil structure, and water retention of the soil, making the environment more favorable for the healthy growth of cannabis.

5. Can I make compost tea at home for my cannabis plants?

Absolutely. Making compost tea at home is a cost-effective and eco-friendly way to nourish your cannabis plants. Use high-quality compost, clean water, and proper aeration to create a potent organic fertilizer.


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