Photography by Kaya Kelly Blaze for Herb
Super soil refers to soil that has been pre-prepared to contain enough nutrients to support your cannabis plant throughout the duration of the entire growing process. Another point of super soil is so that growers need not worry too much about pH and nutrients levels. And since you only need to add water to this soil, you can skip the flushing process at the end of the grow cycle.
However, growing with super soil may also take slightly longer, while yielding slightly less. If you’re not careful, you could end up “burning” plants with super soil, too. Still, many growers prefer to use super soil, which more closely mimics the natural outdoor growing conditions of cannabis.
Making super soil requires lots of time, planning, and ingredients. For this reason, some people prefer to simply buy pre-made super soil. However, if you’ve got a DIY spirit, making your own super soil is possible—and easy. In fact, the most difficult part of making super soil is finding the ingredients and having enough patience to wait for the soil to compost once you mix the ingredients together.
The main nutrients your plant will need are Nitrogen, Phosphorus, Potassium, Magnesium, Calcium, and Sulfur. The secondary macronutrients your plant needs are Chlorine, Iron, Copper, Boron, Zinc, Molybdenum, Manganese.
The following ingredients list contains these necessary nutrients and macronutrients. Take a look at the following instructions to learn how to make super soil at home.
*Tip: Organic is always better
14 cubic feet (eight large bags) of high quality potting soil.
1 cubic foot of worm castings
2.5 lbs of bone meal
2.5 lbs of fish bone meal
5 lbs of high phosphorus bat guano
5 lbs of blood meal
3 cups of oyster shells
3 cups of kelp meal
3 cups of alfalfa meal
3/4 cups of Epsom salts
3/4 cups of agricultural lime
2 cups of Azomite
2 tbsp of granular humic acid
2 tablespoons of mycorrhizae/compost tea mix
tarp, kiddie pool, or other material/place that can be used for mixing large amounts of soil without making a mess.
Garbage Cans with Lids
Large Mixing Bowl
Pour all of the ingredients onto your tarp and thoroughly mix them together. Add some water to the mixture until it is moist, but not so much that it will be sopping wet or extremely damp. The point is to make the mixture just wet enough to allow for healthy humidity.
Transfer the mixed ingredients into your garbage cans and put the lids on. Allow the mixture to sit in here for 45 to 90 days so that it can compost. Make sure you keep the garbage cans in a warm place for the duration of these days. At the end of the composting period, you will have your super soil mix.
Once your super soil is ready, it’s time to add it to your plant pots. Fill only the bottom 1/4th to 1/3rd of your pots with your super soil mixture.
In your separate mixing bowl, mix some base soil together with your super soil. Then, add some of this on top of your super soil mix in your plant pot. This layer is called the “buffer zone” and should only be a few inches deep.
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