With marijuana, similar to many other plants, you can plant your seeds directly in the ground or buy soil and grow it in pots. Keep in mind that cannabis plants thrive in soil that’s rich in organic matter, plus they require good drainage.
In terms of the best kind of soil for marijuana, heavy clay soils are not recommended, because they drain slowly and do not hold oxygen well. Sandy soil is easy to work, drains well, and warms quickly. However, it doesn’t hold nutrients well. Silty soil is the ideal growing medium. It’s easy to work, warms quickly, holds moisture, has good drainage, and it contains a lot of nutrients. The best silty soil is a dark crumbly loam, which is very fertile.
If you want to ensure the best results with your soil, consider having it tested, which is easy and relatively inexpensive. A soil testing service will tell you the makeup and pH of your soil, reveal any contaminants, and recommend the best fertilizers for the soil.