Choosing The Best Soil For Growing Cannabis

First Published on WEEDSPEEK.COM

Cannabis is a flowering plant, and to grow these plants, we need to provide them with the right conditions. One important factor when growing cannabis is soil quality.

If you are thinking about growing cannabis but are unclear about the type of soil to plant your cannabis seeds, you have come to the right place.

What is Soil?

Soil is material covering the earth’s surface made from the weathering of rocks. It comprises mainly mineral particles, organic materials, air, water, and living organisms, interacting slowly yet constantly.

Soil color describes the type of plant life present in an area. Some places will have more green soil, while others might have more brown or red soil.

Soil minerals come in three size classes — clay, silt, and sand; the percentages of particles in these size classes are called soil texture.

Soil texture affects how easily water moves into, through, and out of the ground. For example, clay soils have a smaller particle size than silt or sand. Clay soils are sticky and clump together, whereas sand is loose. The large particles in silt make it difficult for water to move through as they can’t pass through so easily as clay can.

person kneeling on ground hands in soil for growing cannabis
Photo by GreenForce Staffing on Unsplash

Best Soil For Growing Cannabis Outdoors

In gardening, the type of soil has a significant impact on the success of plants. For example, if a garden has a lot of clay, it will be very fertile and suitable for vegetables. Gardeners need to know which kind of soil they have and which plants can thrive in that environment.

We have listed the three basic soil types for growing cannabis outdoors:

Sand: This type of soil comes from arid desert areas. Sand has a lot of air pockets and can dry out quickly. But it does not hold onto water for very long and often becomes too complicated when wet.

Clay: This type of soil retains water and nutrients, but it does not drain quickly, making it difficult for the plant roots to get air.

Silt: In this soil type, particles are much more refined than sand or clay, with fewer air pockets. It also holds onto nutrients better than sand but drains well when wet, making it perfect for growing marijuana plants that need consistent watering.

There are many ways for preparing the soil before planting cannabis, but these are some common methods.

  • Tilling is a term used to describe a process that turns over the top layer of dirt. This exposes weeds, seeds or roots that may have been missed during tilling by hand or a tilling machine.
  • We all know that composting is an environmentally friendly and sustainable way to improve your garden by letting it reuse its ingredients over and over again. It also adds nutrients back into your plant’s soil!


Indoor grow house showing soil for growing cannabis
Photo by CRYSTALWEED cannabis on Unsplash

Best Soil For Growing Cannabis Indoors

Cannabis has consistently been grown outdoors. However, the legalization of cannabis in some states has many people looking for a way to indoor grow.

It’s essential to pay attention to what type of soil you are using because they all behave differently. You can choose from different soils, but the three main types are organic soils, hydroponic soils, and inorganic soils.

Organic soils are preferred for growing weed indoors because they contain all the nutrients that plants need. They also have natural pest repellants which will ensure that you have less trouble with bugs and insects.

Hydroponic soil with polymers holds up to 1000% more water than traditional soil. It is essential for indoor growers without needing a greenhouse, hot summer days, or an expert on hand. They can provide an excellent environment for healthy growth and productivity by providing easy access to nutrients and oxygen.

An inorganic soil is not too porous, and it’s high in nutrients, making them perfect for growing cannabis indoors. They include bark, peat, coco coir, and perlite. They allow for a steady supply of water and nutrients while preventing excess drainage from the roots.

soil for growing cannabis
Photo by Neslihan Gunaydin on Unsplash


The Importance of a Good Potting Mix For Cannabis Growers

A cannabis grower should consider using a good potting mix when they are growing their plants. This type of potting mix is necessary for cannabis plants to thrive.

Loam is a recommended potting mixture composed of sand, silt, and clay. The best thing about loam is that it allows water and air to move freely through it, so your plants will get plenty of both items. It’s also very fertile.

A good potting mix can help prevent root rot and reduce the chances of diseases in the plants. It will also help in improving nutrient uptake, water retention and speed up plant growth.

In The End

Soil is the foundation of all gardeners’ work. Not only does it provide structure and support for plants, but it also provides drainage and aeration that’s required for water and air to be absorbed. Without proper soil, plants will not thrive and may even die off.

We hope you find it easier to choose the best soil for growing your cannabis with this article.


DripWorks. (2020, August 4). The Best Soil for Growing Marijuana Outdoors. Default Store View.

Hernandez, F. (2021a, March 22). Best Soil For Growing Weed Indoors. Cannabis Training University.

Hernandez, F. (2021b, March 22). Best Soil For Growing Weed Indoors. Cannabis Training University.

Queensland;, C. O. S. O. (2013, October 8). How soils form. Environment, Land and Water | Queensland Government.

Seeds, S. (2020, May 22). Best Soil for an Outdoor Cannabis Garden. Sensi Seeds.

Top 15 Best Soil for Cannabis Reviews. (n.d.). InsideHerbGardens. Retrieved October 9, 2021, from

What Are Soils? | Learn Science at Scitable. (n.d.). Learn Science. Retrieved October 9, 2021, from


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