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weird algae on steps

darnell_debdarnell_deb Posts: 16
in Problem solving
weird dark green crinkly algae on steps - disappears when dry and reappears when wet - tried scraping and cleaning to no avail - how do i eradicate? Many thanks, Debs

Posts

  • herbaceousherbaceous Posts: 2,318
    Try Googling nostok and see if that is what you have, oh and welcome to the forum  :) 
    "The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it."  Sir Terry Pratchett
  • darnell_debdarnell_deb Posts: 16
    Hi Herbaceous - thanks - that looks like the ugly little forker!
  • herbaceousherbaceous Posts: 2,318
    Good luck with getting rid of it  :)  apparently an ancient 'thing' and only grows on poorly drained surface so it keeps coming back in one corner of my patio steps!  Learned to live with it now until it goes crispy.
    "The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it."  Sir Terry Pratchett
  • darnell_debdarnell_deb Posts: 16
    if all else fails I'll replace the step and make sure it has run-off! I won't be beaten by something that should be blooming extinct! (fingers crossed!)
  • herbaceousherbaceous Posts: 2,318
    I wish you good luck, just remember it's had millennia to work out it's survival techniques!

    "The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it."  Sir Terry Pratchett
  • BobTheGardenerBobTheGardener Posts: 11,385
    There's a really long thread about this but to save you some time, the conclusion seems to be that washing soda (Sodium carbonate) is the only thing which works (apart from groundworks to improve drainage, that is.)
    A trowel in the hand is worth a thousand lost under a bush.
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