Ask Us

A Quick Guide to Building the Best Soil for Cannabis 

A Quick Guide to Building the Best Soil for Cannabis 

Building the best soil for growing weed can take time to master, but most growers don’t have that luxury. This is why we have created a straight-to-the-point guide on the basics for building the best soil for marijuana! That way you can spend less time studying and more time growing. Let’s get down and dirty y’all! 

What We Will Cover: 

Varieties and Common Characteristics of Soil

Building the best soil for cannabis plants 

Amendments and additives for your cannabis soil mix 

The RIGHT Recipe for your Reefer 

Common Characteristics of Soil

Soil is a mixture of organic and inorganic materials that provide nutrients and support for plant growth. The common traits of soil include:

Texture: Soil texture refers to the size of the particles that make up the soil. The three main types of soil texture are sand, silt, and clay. A good soil mix should have a balance of these three types of particles.

pH: Soil pH is a measure of how acidic or alkaline the soil is. Cannabis plants prefer slightly acidic soil with a pH between 6.0 and 7.0.

Nutrients: Soil nutrients are essential for plant growth and bigger better quality buds when harvesting cannabis. The three main nutrients that cannabis plants require are nitrogen, phosphorus, and potassium.

Drainage: Good drainage is essential for healthy plant growth. Soil that retains too much water can lead to root rot and other problems.

The Different Varieties of Natural Soil

There are several varieties of soil that can be used for growing cannabis plants. It is important to note that not all cannabis requires the same soil, nutrients, and/or substrates. Let us first get familiar with the most common types of natural soil for weed and the positives and negatives of each. 

Here are some of the pros and cons of each type of natural soil for marijuana:

Sandy soil:

Pros: It provides good drainage and is easy to work with.

Cons: It doesn’t hold nutrients well and can dry out quickly.

Silty soil:

Pros: It holds moisture well and is easy to work with.

Cons: It can become compacted easily, which can lead to drainage problems.

Loamy soil: Loam is a mixture of clay, sand, and silt, which makes it the best soil mix for growing marijuana plants and many other types of crops. The optimal ratio for loam is 20% clay, 40% silt, and 40% sand.

Pros: It holds moisture well, provides good drainage, and is rich in nutrients.

Cons: It can be expensive and heavy.

Clay soil:

Pros: It holds moisture well and is rich in nutrients.

Cons: It can become compacted easily, which can lead to drainage problems.

Living soil: 

Pros: It allows for fully organic growing without the need for additives.

Cons: It can be more difficult to manage than other types of soil.

It’s important to note that the best soil for cannabis plants is a well-draining mixture that is rich in organic matter and has a pH level between 6.0 and 7.0. When choosing a soil for cannabis, it’s important to consider the main factors which are drainage, nutrient content, and ease of use.

Amendments to Improve Soil for Your Cannabis Plants:

Amending your soil can immensely improve its texture, pH, and nutrient content. We’ve compiled a list of the most common amendments for creating the best soil for marijuana. 

Perlite: Perlite is a lightweight volcanic rock that helps improve drainage in the soil.

Vermiculite: Vermiculite is a mineral that helps retain moisture in soil.

Coco Coir: Coco coir is made from coconut husks and helps improve water retention in soil.

Worm Castings: Worm castings are rich in nutrients and help improve the texture of the soil.

Additives for Soil When Growing Cannabis

In addition to amending your soil, you may also want to introduce some additives to help your cannabis plants grow better. Some classic additives that will take the fertilization of cannabis to the next level are: 

Mycorrhizae: beneficial fungi that help improve nutrient uptake in plants.

Bat Guano: rich in nitrogen and other nutrients that are essential for plant growth.

Bone Meal: high in phosphorus and helps promote root growth.

Dolomite Lime: Promotes plant growth, neutralizes soil acidity, and improves nutrient availability. 

Friendly Reminder: When germinating cannabis seeds keep your soil simple, high levels of nutrients are not necessary this early on in the cannabis plant’s growth stage.

Recipe for Building Your Own Soil for Weed

Building your own soil mix for cannabis can be a cost-effective way to provide your plants with everything they need to grow healthy and strong. Here’s a simple recipe for building your own super soil mix:


1 part peat moss

1 part compost

1 part coco coir

1 part perlite

1/2 cup bone meal

1/2 cup bat guano

1/2 cup kelp meal

1/2 cup worm castings

Simple Instructions:

1. Combine 1 part peat moss, 1 part compost, 1 part coco coir, and 1 part perlite in a large container or wheelbarrow

2. Add 1/2 cup bone meal, 1/2 cup bat guano, 1/2 cup kelp meal, and 1/2 cup worm castings to the mixture

3. Mix all of the ingredients together thoroughly

4. Use the soil mix immediately or store it in a cool, dry place until ready to use

The “Bottom” Line… 

Building the best soil for cannabis plants requires careful consideration of the common varieties of soil. Amendments and additives improve natural soil and substrates while balancing the proper pH and nutrient availability for your cannabis. By providing your plants with the right type of soil mixture, you can ensure healthy growth,  high-quality yields, and strong development of trichomes. It doesn’t matter if you are growing indoor, outdoor, or in a greenhouse, just stay open-minded in learning all the tips for growing marijuana and more importantly don’t be afraid to get your hands dirty! Happy Planting!

Reading next

Cannabis Trichomes: All You Need To Know 
Cannabis Super Cropping

Leave a comment

All comments are moderated before being published.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.