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star jelly, Nostoc

bédébédé Posts: 3,095
in Problem solving
In the cippings on my flat roof.  How do I kill it.
 location: Surrey Hills, England, ex-woodland acidic sand.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
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  • BobTheGardenerBobTheGardener Posts: 11,385
    There's a massively long thread about it on here somewhere, but the only thing which seems to work against Nostoc commune is a solution of washing soda (Sodium Carbonate.)  Good luck.
    A trowel in the hand is worth a thousand lost under a bush.
  • bédébédé Posts: 3,095
    edited August 2021
    Thank you Bob.  I am now a bit of an expert.  2 years ago, a small test with Ferrous Sulphate worked, but caused rust discoloration.  This was as expected and so done in an out-of-sight area.  Elsewhere household bleach at full 5% NaOCl strength can be sprayed.  (US sources say: 10% farm grade.) It worked well, if dangerously .  But after all the rain it is coming back.
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • bédébédé Posts: 3,095
    ps how can I correct: spelling, grammar, typos, mistakes
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • bédébédé Posts: 3,095
    BobTheGardener said:
    There's a massively long thread about it on here somewhere, but the only thing which seems to work against Nostoc commune is a solution of washing soda (Sodium Carbonate.)  Good luck.
    BobTheGardener said:
    There's a massively long thread about it on here somewhere, but the only thing which seems to work against Nostoc commune is a solution of washing soda (Sodium Carbonate.)  Good luck.
    What concentration for the washing soda?
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • FairygirlFairygirl Posts: 55,117
    The black cog in the top right of your post is the edit button. You have just under an hour after posting to make changes, or add to your post   :)
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • bédébédé Posts: 3,095
    If you search Nostoc, you will see my safety advice about Sodium Hydroxide/caustic soda and Washing Soda.  IMPORTANT.
     location: Surrey Hills, England, ex-woodland acidic sand.
    "Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
  • BobTheGardenerBobTheGardener Posts: 11,385
    This page may be useful - it even refers to the very thread I mentioned earlier:

    A trowel in the hand is worth a thousand lost under a bush.
  • FairygirlFairygirl Posts: 55,117
    Caustic soda is dreadful stuff.  :/
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
  • BobTheGardenerBobTheGardener Posts: 11,385
    Fairygirl said:
    Caustic soda is dreadful stuff.  :/

    Yes it is, so it's a good job that Sodium Hydroxide (Caustic soda) is NOT what is being recommended here. :)
    A trowel in the hand is worth a thousand lost under a bush.
  • FairygirlFairygirl Posts: 55,117
    Indeed @BobTheGardener - I was just picking up on it being mentioned in that post at 11.01 - in case anyone thought it was ok to use, or was confused about which one was which    :)
    It's a place where beautiful isn't enough of a word....



    I live in west central Scotland - not where that photo is...
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