How to Make Super Soil for Cannabis, From Base Mix to Amendments

To make super soil, you start with a fluffy, slightly acidic base mix (quality soil, vermiculite, coco and perlite, and compost in equal parts), add organic amendments for nitrogen, phosphorus and potassium plus beneficial microbes, and let it all "cook" for about 30 days before planting. Super soil, also called supersoil, is a heavily enriched homemade growing medium built to give plants everything they need for growth and flowering.

Because it's so loaded, this kind of soil can take away the need for extra fertilizer through the plant's entire life cycle, which is why it's a favorite with cannabis growers and other gardeners alike.

Learning to make your own homemade growing medium isn't as complicated as it sounds. Super soil ingredients vary depending on the gardener's preferences and the needs of the plants being grown, but a few basic components show up in almost every recipe.

By combining a mix of organic and inorganic materials, gardeners can build a nutrient-rich, balanced soil that drives vigorous growth and heavy flowering in all kinds of plants.

How do you prepare the base soil before adding nutrients and amendments?

Knowing how to make a homemade medium like super soil is a big deal for gardeners who want to grow organically and get the most nutrients to their plants. It takes time and space to prepare, but the results are worth it.

Making a good growing medium for cannabis plants starts with picking the right ingredients. You'll need a high-quality base soil, the main macro- and micronutrients, and a diverse crew of beneficial microorganisms. It's also worth adding materials that improve aeration, water retention and pH stability.

Bottom line: making super soil is a must for anyone who wants to grow organically and give their plants the nutrients they need to grow healthy. Pick your ingredients carefully, give the mix the attention it needs while it cooks, and you'll end up with a nutrient-packed homemade cannabis soil that drives strong growth and heavy flowering.

What are the key ingredients for super soil?

Super soil is a nutrient-rich medium that's great for growing plants, especially cannabis. Here are the key ingredients for making your own and boosting your plants' growth organically:

Base soil:

The base soil is the structure the rest of the growing medium is built on. It should be fluffy, airy and slightly acidic. A recommended mix:

• 25% quality soil
• 25% vermiculite
• 25% coco coir and perlite, mixed 50/50
• 25% homemade compost

Essential nutrients:

For optimal growth, you need to add the main macronutrients (nitrogen, phosphorus and potassium) and micronutrients (zinc, boron, manganese and others). Some common sources:

• Worm castings: rich in nitrogen and other essential nutrients, and they encourage microbial life.
• Blood meal: an organic source of nitrogen.
• Bat guano: rich in phosphorus and nitrogen, key for healthy growth.
• Bone meal: a source of phosphorus and calcium, both fundamental for plant development.
• Kelp (seaweed): adds nutrients, vitamins and plant hormones for vigorous growth.
• Palm ash: rich in potassium and magnesium, important for heavy flowering.

Microbial life:

Beneficial bacteria and fungi are a must for building a healthy soil food web. They help plants take up nutrients and keep diseases at bay. Add the bacteria first and wait a few weeks before adding the fungi, so each one can properly colonize the medium.

Other ingredients:

On top of the basic nutrients and microbial life, a few extra ingredients can take your soil up another notch:

• Dolomite lime: helps regulate soil pH and nutrient uptake.
• Charcoal: improves soil aeration and releases nutrients gradually.
• Blackstrap molasses: food for soil microbes that speeds up their activity and helps them settle in.

Once everything's mixed, let the soil rest for about 30 days so the ingredients can fully break down. After that, your super soil is ready for both in-ground beds and containers.

How to use super soil the right way for a healthy grow

When you're using super soil, a few ground rules keep your plants happy and out of trouble. Here are the key tips:

1. Cut the super soil:

This homemade cannabis soil is highly concentrated, which can hurt your plants if you use it straight. Mix 1 part super soil with 3 parts regular organic soil for a more balanced medium. For example, for 1 kg (about 2 lb) of soil in total, put 250 g of super soil in the bottom of the container and top it off with 750 g of regular soil.

2. Extra feeding:

If your plants need more homemade nutrients, you can use super soil as a slow-release top dressing. Every time you water, it'll deliver extra nutrients to the plant.

3. Mix it properly:

Super soil can be too hot if it's not mixed well. Make sure it's evenly blended with the rest of the soil to avoid burning the roots.

4. Keep an eye on pH:

There's no need to adjust the pH of your soil or water if they're in the 6 to 7 range and don't carry more than 400 ppm of dissolved minerals. If your tap water isn't great, you can filter it before using it. Once you've got a good water source, you don't need to keep checking pH unless your plants show signs of a deficiency.

How to avoid root burn with super soil:

Sometimes a living soil grow can be too strong for young plants and end up burning their roots. To avoid that, consider these options:

• Germinate your seeds in unfertilized soil and transplant them into containers with super soil once they're 2 to 3 weeks old.
• Fill the bottom of the container with super soil and the top with unfertilized soil, so the nutrients become available gradually as the roots grow down.
• For autoflowers, use a bigger container with super soil at the bottom and a smaller pocket of unfertilized soil in the middle. That keeps the roots from burning until they're mature enough to handle the super soil.

Follow these tips and you'll get the most out of your super soil and grow healthy, vigorous plants.