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Slimy Fungus on gravel

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  • bédébédé Surrey Hills, acid greensand.Posts: 172
    Be very very careful with caustic soda/sodium hydroxide.  It is very corrosive to skin.  Avoid is best advice.

    It you think you can handle it, dissolve it carefully.  Always add the NaOH slowly to water, with constant stirring (but no splashing).  It will heat up.
     NEVER add water to the dry caustic soda !!!
  • bédébédé Surrey Hills, acid greensand.Posts: 172

    Concentrated Washing Soda is dangerous also, follow the instruction on the pack.
    I spray path weeds with neat malt vinegar (esp during lockdown) it works quickly on top growth.  I have trialled this on some Nostoc, and will report.
    Boiling water also works.
  • BobTheGardenerBobTheGardener Leicestershire, UKPosts: 11,119
    Do not use Caustic soda (Sodium hydroxide) for this purpose!

    It is Washing Soda (Sodium Carbonate) that is being recommended, a much, much less hazardous substance, but still needs to be used with care and by following the method shown, which has been summarized on this page:


    A trowel in the hand is worth a thousand lost under a bush.
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