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Blanket weed

How do you get rid of blanket weed without killing the lillies in the pond? 

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  • DovefromaboveDovefromabove Central Norfolk UKPosts: 82,102
    We’ve used Blagdons Barley Straw Extract in our wildlife pond ... it gets rid of the blanket weed and doesn’t harm the wildlife. 

    https://www.blagdonwatergardening.co.uk/Products/Test-Kits-Treatments/Green-Water,-Dirt-Algae/Barley-Straw-Extract-250ml

    If if there’s a lot of blanket weed you may need to follow up wighBlagdons Sludgebuster to deal with too much sludge at the bottom of the pond. Again it works and doesn’t harm the wildlife. 

    Im not connected with Blagdons in any way ... just a very pleased customer over several years. 
    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh







  • DovefromaboveDovefromabove Central Norfolk UKPosts: 82,102
    I should add to the above that now we’ve an established colony of pond snails they keep the levels of blanket weed down. 
    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh







  • Pete.8Pete.8 Billericay, EssexPosts: 9,852
    If it's a fish pond and not a wildlife pond then Cloverleaf does a good job.
    I use it once or occasionally twice in a season and it keeps the blanket weed at bay in my koi pond with no detrimental effect on the huge lily.

    I took @Dovefromabove advice re Blagdon Barley straw extract and Blagdon Sludge Baster when I put my little wildlife pond in (I also got pond snails last year on her advice) and the pond is doing very well.

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • DovefromaboveDovefromabove Central Norfolk UKPosts: 82,102
    Really pleased to hear that @Pete.8 😊 
    “I am not lost, for I know where I am. But however, where I am may be lost.” Winnie the Pooh







  • BenCottoBenCotto RutlandPosts: 4,039
    We have one of these. It’s very effective at hoiking out the blanket weed and it is also therapeutic. Less therapeutic is finding next morning what’s left behind is growing exponentially.

    https://www.pondkeeper.co.uk/pondxpert-blanketweed-brush-set/p3211

    Last season we used this extract and it was totally effective but it did leave a kind of sludge of dead blanket weed on the pond floor. Of all the blanket control treatments, this one has proved to be most effective in tests.

    https://www.ketteringkoi.com/nishikoi-clear-waters-blanketweed-treatment-1-litre/

    We also have about 5 mini bales of barley straw in there. I assume without them the problem would only be worse.

    Like Dove we have pond snails but, unlike Dove’s, ours are inclined to celibacy. Slowly the numbers are increasing. 

    I also bought recently 25 bunches of oxygenators hoping they will absorb the excess nutrients in the water.

    https://www.ebay.co.uk/itm/1-50-Bunches-Oxygenating-Pond-Water-Plants-Ceratophyllum-Weighted/161675946591?hash=item25a4a32a5f:m:mAl8OvX8yl3ttf0JwIgkLoQ

    Our pond is about 15’ x 13’.





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