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Moss, Weeds in Paving Stones

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Posted by: from Oakville
5/20/2013 at 4:43:55 PM

Anyone know a good chemical treatment to rid weeds and moss in shady paving stones and what can be an annual treatment?

Have heard baking soda, bleach, salt, pressure wash, etc etc, but, need a real solution that one can spray yearly.

Any pros know a moss killer (for good). Removing stones and restarting is not an option.

Yes it was laid professionally with all the layers of fabric, stone, sand, sealer.

Ammonium sulfate??

REPLIES (5)
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Date/Time5/20/2013 at 9:21:32 PM

Raise the walking stones so that when it rains or you water the condensation will run off the stones onto the surrounding area.

Moss grows from damp conditions, try changing the conditions. At the moment the water is possibly remaining on the stones for a longer period in a shaded area. Make it so the stones are allowed to dry off fast. Many times walking stone become lower than the surrounding area, just raise them 1/2 inch above everything.

I am just generalizing, maybe something to consider.

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Date/Time5/21/2013 at 12:39:58 AM

Sorry but dont think anything will kill moss or weeds for good, over time with organic material floating around they will re-appear. sand is the perfect growing condition for most weeds to grow in.

What kind of sealer did you use before??

I do like the idea posted before about raising them, but there still may some area's of low spots for growth

If they are like stepping stones or 'flagstone , another option is using low groundcover of plants such as 'creeping thyme', wooly thyme, scotch moss, white maiden pinks, they provide colour and aroma when walked up, can help to suppress and choke out other weeds, and no harm in trimming back with a weed whacker.

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Robert from Electrilight Ltd. in Oakville
Date/Time5/21/2013 at 7:28:29 AM

Thanks, unfortunately, the stones 4"x4"x2" have been laid as a path, driveway and rear terrace. The water already flows easily as they are downhill. Trouble is after cleaning them last year of moss, this year the moss is greener and thicker!! Better conditions and no full sun more than 3-4 hours per day.

Have heard many pros use chemicals to kill them annually, previous owner used something (no longer around) but for me, pressure washing annually is not ideal.

I know sanding and sealing will help, maybe silica sand and sealant will help best.

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Date/Time5/21/2013 at 11:51:50 AM

For our restoration jobs we often encounter weed problems. We use an old formula: 4 liters of vinegar, 1/2 cup of salt and 1/4 cup of dish soap all mixed up. Works great.

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Robert from Electrilight Ltd. in Oakville
Date/Time8/13/2013 at 10:28:13 PM

So the vinegar, salt and soap solution didn't last that long, actually, it seems the moss came back even greener!!

Any other ideas to kill weeds and moss for an entire year?

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