How to Increase THC Content in Cannabis: A Comprehensive Guide

How to Increase THC Content in Cannabis: A Comprehensive Guide

How to Increase THC Content in Cannabis: A Comprehensive Guide

Tetrahydrocannabinol (THC) is the primary psychoactive compound found in cannabis plants. It’s responsible for the euphoric “high” that users experience when consuming marijuana. As such, many cannabis cultivators aim to increase the THC content in their plants to create a more potent product. In this comprehensive guide, we will discuss various factors and techniques that can help you increase the THC content in your cannabis plants.

Choose High-THC Strains

Your choice of strain plays a crucial role in determining the potential THC content of your cannabis plant. To increase THC content, it’s important to start with a high-THC strain genetically predisposed to produce higher levels of the compound. Some popular high-THC strains include Gorilla Glue #4, Girl Scout Cookies, and Bruce Banner.

Optimise the Environment

Creating the ideal growing environment for your cannabis plants is essential for maximizing their THC content. Here are some factors to consider:

Light: Cannabis plants need an abundance of light to facilitate photosynthesis and produce THC. Ensure your plants receive enough high-quality light, either from sunlight or high-intensity LED or HID lights.

Temperature and humidity:

Cannabis plants thrive in temperatures between 70-85°F (21-29°C) during the vegetative stage and 65-80°F (18-26°C) during the flowering stage. Humidity should be maintained at 40-60% during the vegetative stage and 40-50% during the flowering stage. Too much heat or humidity can stress the plants, leading to lower THC levels.

Air circulation:

Proper air circulation is essential for cannabis plants to grow well and avoid mold or pests. Ensure that your grow room has enough ventilation and air exchange.

Nutrients and Soil

Providing your cannabis plants with the right nutrients is essential for their overall health and THC production. Some crucial nutrients for cannabis plants include:


Necessary for plant growth and development during the vegetative stage.


Critical for root development and flowering.


Essential for overall plant health, stress resistance, and bud development.

Use a well-balanced cannabis-specific nutrient solution to ensure your plants receive the correct nutrients. Additionally, a well-draining soil with a pH of 6.0-7.0 is ideal for cannabis growth.

Training Techniques

Manipulating your cannabis plants can help increase THC content by encouraging more bud sites and healthier growth. Some popular training techniques include:


Removing the top shoot of the plant, encouraging lateral growth and more bud sites.

Low-Stress Training (LST):

Gently bending and tying branches down to promote an even canopy and more bud sites.

Screen of Green (ScrOG):

Using a mesh screen to support and spread out the plant’s branches, ensuring even light distribution and maximizing bud sites.

Harvest Timing

To maximize the THC content of your cannabis plants, it’s crucial to harvest them at the right time. Harvesting too early or late can result in reduced THC levels. Monitor the trichomes (small resin glands) on your buds using a magnifying glass or microscope. When the trichomes turn from clear to a milky white color, with some turning amber, it’s the optimal time to harvest for the highest THC content.


Increasing the THC content in your cannabis plants involves a combination of choosing the right strains, optimizing the growing environment, providing proper nutrients, applying training techniques, and timing your harvest correctly. By focusing on these factors, you can maximize the potential THC content in your cannabis plants and produce a more potent product.

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