Return to the Northwestern Gardening Forum | Post a Follow-Up

My Green Patio

Posted by dottyinduncan z8b coastal BC (My Page) on
Sun, Mar 1, 09 at 2:29

This is the time of year that everything looks green -- including the exposed aggregate cement patio. Ours is quite rough and to pressure wash it takes forever. Does anyone have a secret to getting rid of this winter mould?

Follow-Up Postings:

RE: My Green Patio

There are various enzyme-based cleaners on the market for this purpose. You can usually find them at places like home improvement stores (Lowe's, HD). They are typically concentrates you dilute and spray on, allow to sit for a period of time then hose and brush off. About as much time and effort as involved as power washing, all in all :-)

Using a bleach solution works well also but poses some issues with the environment - at least the immediate environment. The enzymes are totally safe.

As you might tell, I have the same issues. With our moist winters, concrete surfaces that are not in a full open exposure tend to grow some serious crops of algae over winter. And older pavers or exposed aggregate surfaces seem to do a better job of hosting them than smooth finishes. Sealing the surface might be the only long term solution.

RE: My Green Patio

Thanks for this. It's an annual thing for us here and it just looks so nasty. One year, I had a big bottle of detol and used it on a north facing brick wall and it stayed ok for a few years. I was hoping there was a magic bullet but, sigh, I don't think there is. Oh well, misery loves company and I bet we have lots of company in this PNW!

RE: My Green Patio

My cedar deck is slimy and green. Especially between the door to the bedroom and the hot tub. ICK.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Northwestern Gardening Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here