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Powdery Mildew

Can anyone recommend a way to combat Powdery Mildew?

I always try not to catch the leaves when watering and the ground was mulched earlier this year however the past week I have noticed Powdery Mildew creep onto my Sweet Pea's and today it looks awful.

I also spotted it on my new Clematis at the other side of the garden (albeit I have a small garden) which I only planted a couple of months ago and after closer inspection it seemed to have affected a few parts of it.
I have removed the affected leaves but it looks like I may have to cut a few parts off :/

Can anyone recommend on how else to deal with it? I try not to use sprays too much in my garden unless they are organic.



  • DovefromaboveDovefromabove Posts: 85,976

    It tends to strike when the plants are stressed, usually due to drought - keep the soil moist image

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • I water every night and occasionally mornings too if it's given hot weather lol

  • LiriodendronLiriodendron Posts: 8,204

    Mildew seems to strike in a position where there isn't much air movement - climbers on a house, peas or sweet peas growing very close together etc.  I haven't used it, but I believe there's an organic spray based on natural oils (made by Vitax I think) which is recommended for powdery mildew.  You're right to remove the worst affected bits, and clear up & destroy dead leaves.  My sugar peas get it every year - it's always a race to eat the peas before the mildew strikes...

    Since 2019 I've lived in east Clare, in the west of Ireland.
  • I think I will definitely check the spray out.

    I'm not too concerned about the sweet peas, well I am but you know what I mean lol, but the clematis worries me seeing it's new and really just getting settled in image
  • Thank you image

    The Sweet Peas are close together but the Clematis only has a small ground cover geranium also planted on the same day beneath it to the right, but there is still a fair bit of space between them, I guess it's just one of those things!
    I am having a look at the recommendations online now image

  • Ngcards, did this in the sweet pea thread recently.

  • just realised it's on my chocolate cosmos too and was so when I bought it, sigh.
  • DovefromaboveDovefromabove Posts: 85,976

    I'm wondering whether the clematis and the cosmos were not watered consistently at the Garden Centre before you bought them - this has been the case with some plants that I've bought n the past - the results of the stress don't show until some weeks later image

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • FleurisaFleurisa Posts: 779

    Is your clematis planted near to a wall or fence, and if so how far away? The higher the wall or fence the wider the rain shadow (when we get any rain) Did you plant the clematis the recommended 2 inches deeper than in it's pot?

  • Yes I planted it the corrected depth and there is a gap between it and the fence.

    Thanks for the top buddy boy and your reply dove image
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