Would you wash these stones?

Discussion in 'Landscape Architecture and Design' started by Hotty Toddy, Jan 27, 2020.

  1. Hotty Toddy

    Hotty Toddy LawnSite Senior Member
    Messages: 292

    I’m putting in a landscape for this north facing facade. You can see mildew on the stone edging, porch, and even the house itself.

    would you clean the stone edging or leave it as a patina? What would you do or recommend regarding the mildew on the house? 8E5ECCFC-41BF-4137-B04F-8E7992692FA6.jpeg 8C4D2B19-D0CF-4392-B775-10419D33F671.jpeg
     
  2. hal

    hal LawnSite Silver Member
    from Georgia
    Messages: 2,707

    Get a bleach/soap mix in a spray bottle and spray them, water down all areas first, wait about 20 minutes, rinse everything off, might need a little pressure, if need be do it twice.
     
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  3. phasthound

    phasthound LawnSite Fanatic
    Messages: 6,007

    Then you must reduce the source of moisture that is causing the fungal growth.
     
  4. Mowing monkey.

    Mowing monkey. LawnSite Senior Member
    Messages: 921

    Like rain? The only way I know to help would be to reduce shade and get rid of the mulch in favor of stone.
     
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 16,415

    Mildew is fungus. Try a fungicide. Maybe an inexpensive copper fungicide would work. Lichens-maybe.
    Or--could be algae on the stones. Maybe an algicide would suit the situation. Try Roundup and various types of vegetation killer--diquat or Scythe.
    https://www.greenhousemag.com/article/gm1113-algae-invasion-management/

    https://www.solutionsstores.com/diquat-dibromide-aquatic-herbicide

    and
    https://www.pedchem.com/products/zerotol-2-0-fungicide-algaecide-bactericide

    for most mosses:
    https://www.ewingirrigation.com/scythe-herbicide-2-1-2-gallon.html
     
    Last edited: Jan 27, 2020
  6. OP
    OP
    Hotty Toddy

    Hotty Toddy LawnSite Senior Member
    Messages: 292

    CD2FBE9C-DD90-491B-BFAB-F6880486F339.jpeg 4C7DDAD2-88CC-4BAA-953D-95262CEAF8FD.jpeg I sprayed with bleach a test spot today. I used a 1:6 mixture of Clorox Outdoor Bleach and water (can’t for the life of me find the concentration of this bleach).

    I wet down the stones. Applied. Waited about 15 minutes. Rinsed. These are the results.
    Should I go with a stronger dilution? Or just do several applications? I’ll be working on the landscape next week and have a few days on site.
     
    Cam15 likes this.
  7. That Guy Gary

    That Guy Gary LawnSite Gold Member
    Messages: 3,387

    You can go heavier on the bleach, 50/50 is effective. You'll need to scrub with a stiff nylon brush too.

    You can also use vinegar straight or 1 cup borax in 3 gals hot water. I'd avoid the vinegar around grass though. You can use the borax around grass if you saturate it first and flush it when done, this should prevent burning.

    Let whatever solution you use soak for 15 minutes, scrub, rinse, repeat if needed.
     
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  8. rlitman

    rlitman LawnSite Silver Member
    Messages: 2,370

  9. hort101

    hort101 LawnSite Fanatic
    Male, from S.E. New England
    Messages: 20,073

    Cam15 likes this.
  10. OP
    OP
    Hotty Toddy

    Hotty Toddy LawnSite Senior Member
    Messages: 292

    Cam15 likes this.

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