When you first start growing, the costs can add up quickly. So, I always look for ways of lowering those costs and one thing that helps save a decent amount is reusing soil/coco coir. When I purchased soil for my first grow, it cost me about $75-80CAD. It doesn’t seem like a huge cost but if you’re buying fresh soil/coco coir each time, it can certainly add up. Since I was already using Gaia Green Dry Amendments, I decided to try re-amending the soil with nutrients and reuse it.

You will want to purchase or repurpose a large storage tote, large container or use a wheelbarrow to mix the growing medium. This will reduce the mess that you’ll make when mixing it all together. I repurposed an extra storage tote that I had. It worked well because I kept the soil that was left over in the tote until it was needed.

Prepping the growing medium

Before you re-use and re-amend your medium, I recommend you go through it and pull out any bigger masses of roots in the soil or coco coir. The smaller roots that are left behind will break down into nutrients for your plants so don’t worry about getting all of the roots. You’ll also want to break up any clumps in the medium for a smoother mixture. After removing the roots, you may feel it’s necessary to add some more perlite to the medium before amending it with the nutrients. You want to aim for about 10% – 15% perlite in the growing medium to improve the drainage.

Amending your growing medium

This step differs slightly depending if you’re growing photoperiod plants or autoflowering plants. Regardless of exact amounts, you simply add the desired amount of dry amendments to the medium, making sure to break up any clumps in the fertilizer. This will help to prevent “hot” spots of nutrients in the medium. Then, carefully mix the growing medium and nutrients until you’re satisfied with the mixture. You want to make sure you really mix it up so that the nutrients are evenly distributed throughout the medium.

Photoperiod

  • Add 4 tbsp per gallon of medium (70/30 All Purpose 4-4-4, Power Bloom 2-8-4) Ex. 14 tbsps 4-4-4, 6 tbsps 2-8-4 for 5 gallons

Autoflower

  • Add 2 tbsp per gallon of medium of All Purpose 4-4-4. Ex. 10 tbsps of 4-4-4 for 5 gallons

I am currently on my third cycle of re- amending my soil. So it has saved me roughly $150-160CAD so far. Now that money can go towards nutrients, other miscellaneous gardening items, or towards saving for a light upgrade. I definitely enjoy saving that kind of money on supplies when I can and I’m sure you’ll enjoy it too!

If you’d like more information about Growing Organic Cannabis using Gaia Green Dry Amendments Follow this link!

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Beginner's guide to cannabis cultivation, Growing Organic Cannabis Using Gaia Green

10 thoughts on “Re-amending your growing medium using Gaia Green Dry Amendments

  1. Hi MM420 !

    I love the little site you have here, and have used some info here for my current grow, so thank you!

    I had a question about feeding my ladies.

    I started them out in small 4″ pots, in fox farm ocean forest, and transplanted into 5gallon pots with 3 tbsp per gallon 80/20 mix of 4-4-4 and 2-8-4.

    Its been 27 days since my transplant and the plants are starting to fill out the tent… They aren’t showing any deficiencies yet, and I’m planning on changing to flower in the next week.

    My question is how long will the soil be nutrient-rich after the transplant? When should I top dress my next feeding, and should I do a 50/50 blend of 4-4-4 and 2-8-4?

    I appreciate any advice you can offer 🙂

    1. Thanks for your question. I would top dress them tomorrow because i usually do it roughly every 4 weeks after the final transplant. I would do the 50/50 ratio also.

      1. Alright, thanks. I was also wondering if since I transplanted from a small starter cup to a larger 5 gallon pot, will the bottom portion of the pot still be nutrient rich because the roots haven’t reached there yet?

        1. If it’s amended or comes with some nutrients in it then, yes, it’s fine. If it’s reused soil, you need to re-amend the soil first

          1. So I realized I originally commented on the wrong post, so it wasn’t clear if my soil was amended before. My mistake.

            One of my plants was transplanted 10 days later than the others, but I’d like it to finish at the same time. What would you recommend feeding that one to keep it on track with the others?

          2. I would just feed it after 28 days since it’s transplant. Not all the plants will finish at the same time sometimes, but that’s okay. Just make sure all the plants get their last top dress of 70/30 (2-8-4/4-4-4) by the 5th week of flower or somewhere around there.

    2. Mix the gaia green with your new soil. For the beginning of flowering you still want some nitrogen so I recommend using 50/50 4-4-4 & 2-8-4 when transplanting to flower. Then finish off with all 2-8-4 for finishing your flowering.

      Adding some unsulphered black strap molasses @ 1tbsp per gallon or 2 will also help the beneficial microbes. A bloom tea here and there will also ensure you see the best possible results. The goal afterwards when watering is to feed the soil(microbiology) not the plant.

    1. Thank you for your kind words and your question! I found with soil, we did add in some extra to “top it up” each time because you lose some when taking out the roots.

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