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Thread: Green Algae in my Soil

  1. #1
    420 Member Supernaut's Avatar
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    Green Algae in my Soil

    So last night I noticed that the soil in some of my pots had a greenish tint to it. Today I could see it a little better and it seems to be algae.

    What causes this?

    How do I kill it? Preferably naturally, no chemical algaecide ect.

    I thought I might cover the soil with a piece of panda poly and cut out the light to it, but that would cut airflow into my soil, which I would prefer to avoid.

    Any ideas or suggestions?

  2. #2
    420 Member SSNUGS's Avatar
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    Re: Green Algae in my Soil

    you could also look at puting H2O2 (hydrogen peroxide) in with your nute mix. I use 32% h2o2 at 10mil per gallon and I have no issues with algea plus it works great in adding oxygen to the root structure.


  3. #3
    420 Member HeadMed's Avatar
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    Re: Green Algae in my Soil

    Algae is special... Its a single celled plant that can grow from just parts of its self. The only way I have been able to control (I'm in hydro) is to starve it of light. You don;t wanna use an algicide... cause that's just basically an herbicide. Get some thick black plastic... like the husky contractor trash bags and use them to cover the pots and dirt when your not watering.

  4. #4
    420 Member Supernaut's Avatar
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    Re: Green Algae in my Soil

    @SSNUGS - I had read about using h2o2, I may try that to initially kill the algae. By "10mil per gallon", is that 10ml as in milliliters per gallon?

    @HeadMed - I had thought of doing something like that but wouldn't it make it difficult for the soil to breath? If I could leave about a 1/2-1" gap between the top of the pot and the plastic, would that cut out enough light on the algae or would it need to be completely dark? My thought process is that way it would still leave room for aeration.

    Another tidbit of info about the situation. I ONLY have this algae growing in 2 out of 5 of my darkish green colored pots. That's why it was almost difficult to notice last night. There's all the green from the plants and the sides of the pots it kind of just looked like a greenish reflection on the soil or something. The black pots (9 of them) that I'm using show no signs of algae at all. Could the green pots somehow reflect a spectrum of light that is beneficial to the algae?

  5. #5
    420 Member greenadvocate's Avatar
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    Re: Green Algae in my Soil

    Ive had conditions which make the top of the soil prone to collecting algae before, i found that it could be easily overcome by replacing the top 1/2 inch of soil every month or so, this stops the algae forming a hard crust on the top of the soil and preventing water absorbtion... probs good for a bit of fresh soil on top every now and again.

  6. #6
    420 Member SSNUGS's Avatar
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    Re: Green Algae in my Soil

    yes that is 10 milliliters per gallon your using 32% if your using 29% jump it to 12.5 to 15 mils per gallon. Try on one plant first to see how it reacts then if you like the result go at it with the rest of your ladies.

  7. #7
    420 Member SteveHman's Avatar
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    Re: Green Algae in my Soil

    I use an inch of hydroton on top of my coco hempy pots. It blocks the light so the algae can't grow, it also helps keep the moisture in and prevents channeling when watering. A 3-in-1 solution.