Moss or algae? How to eliminate?

thisbettyFebruary 23, 2013

There is greeny/yellow film on large parts of my shady brick patio, which I can't eliminate - it always comes back. It also appears in moderate sun. I have true mosses growing in crevices in the sunny patio.

The film bothers me more - scrubbing, baking soda, lime,
Clorox, Comet, 409- the film is removed temporarily but returns gradually. Accumulated winter leaves increase the problem - but it is in other areas without leaves - and is very slippery when wet..

I would really appreciate your experience and advice.

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Bricks are laid in sand - so no pressure wash.

    Bookmark   February 23, 2013 at 5:28PM
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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL

The concrete steps on our back porch get slippery and slimy too. I pour a little bleach on there, let it sit for a few minutes, scrub with a brush or hard broom, then rinse. You can't keep it from coming back, AFAIK, just clean when necessary. If it's a bunch of separate stones, you could fill a squirt bottle with diluted bleach and spray them. If you do often enough, scrubbing probably wouldn't be necessary, IDK.

    Bookmark   February 24, 2013 at 12:11PM
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topsiebeezelbub(z7 Al)

I have argued with my Mom for years about this. I will NOT put harsh chemicals on my property, slime or no slime. Just get used to it!

    Bookmark   March 16, 2013 at 5:42PM
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Tiffany, purpleinopp GardenWeb, Z8b Opp, AL

I don't own any gardening chemicals, but someone could be seriously injured slipping on the steps, probably me. Keeping them free of slime, necessary about once a year, is not an option. It's not a visual issue, it's a safety issue. Bleach is what I use to clean everything, and definitely kills mold and mildew.

    Bookmark   March 17, 2013 at 9:22AM
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A permanent solution would be nice, but we do the best we can with what we have. It is hard work and it is a little less trouble if I keep the patio really clean (leaves, potting soil, etc.)

    Bookmark   March 21, 2013 at 2:27PM
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