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best growing medium for marijuana seeds

The main advantage of soil is that it is forgiving and beginner-friendly, and you can still crop cannabis of top-notch quality. Soil is also widely available and relatively inexpensive.

What is the best medium to use for your cannabis grow operation? Find out the pros and cons of growing cannabis in soil, coco, rockwool, and hydroponics.


Difficulty: Medium
Cost: Low to medium

Difficulty: Medium/high
Cost: Medium

Growing in soil is the simplest way to get some nice weed plants going, but don’t think that means soil produces poorer results than other methods. Far from it! Many growers say that soil enriched with high-quality compost grows them the best-tasting weed, even if yields aren’t quite as good as in coco or hydro.

If your DIY cannabis soil is rich in organic material, you will likely not need to add nutrients to it. As a matter of fact, some growers make the mistake of adding manure and vegetable scraps to their soil to “fertilise” it. This results in soil getting “too hot” for the plants, hurting their development in turn. If you want to put your vegetable scraps to good use in your garden, you first need to compost them.

When growing autoflowers, stay away from heavily fertilised soils and certain amendments like bat guano, as these will be too hot and overload your plants with nutrients. The same is true for cannabis seedlings, which do not like high levels of nutrients.

• Mixture of sand, silt, and clay
• Pros: Excellent water retention and drainage, contains nutrients, high oxygen levels
• Cons: Expensive


Done! Double-check the pH value of your homemade soil. It should be in the range of 5.8–6.3.

• Fine particle size
• High pH
• Pros: Rich in nutrients, retains water
• Cons: Poor drainage, heavy and compact, hard to work with


Worm castings are normally seen more as a nutritional soil amendment as they contain a plethora of useful microorganisms that benefit growth. But worm castings will also improve the texture, drainage, and water retention of your soil. When amending your soil with worm castings, use about 25–30%.