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Mildew on Clematis

:( I have severe powdery mildew on 4 of my 8 Clematis, oddly all of them are potted.  The ones in the ground are fine.  Nothing to be done I suppose, apart from cutting them back to the base.


  • FireFire Posts: 17,385
    I've been taking it to be something to do with under watering, but I have fed and watered and nothing seems to be shifting it. My new plants look so miserable. I feel like a bad parent.
  • I'm glad it's not just me!  My plants are well cared for (or so I thought!) but still they suffer.
  • I have what was a healthy clematis growing up a trellis against the wall, mixing in with a climbing rose.  Now I find the leaves of the clematis are dying (brown and easy to remove) and the flowering stems are a green/white colour, the flowers look reasonably o.k. but with a tinge of white on them. Is this caused by over watering, lack of feed or something else?
  • Powdery mildew sets in when the roots are too dry and the plant is stressed, you need to get more water under the roots. For plants in pots it is a good idea to stand them in a large saucer and water from underneath.
  • FairygirlFairygirl Posts: 54,009
    Is the rose also stealing a lot of moisture from it, GD?
    Against a wall is always trickier for keeping plants moist enough too. 
    It's a place where beautiful isn't enough of a word....

    I live in west central Scotland - not where that photo is...
  • Guernsey Donkey2Guernsey Donkey2 Posts: 6,713
    edited July 2019
    Since posting my question I have taken a couple of pictures of the poor clematis and thank you @Richard Hodson and @Fairygirl for your suggestions.  The clematis isn't in a pot, it is growing in the bed and up a trellis attached to a house wall.  I must admit I thought I was watering it too much but if you both think the plant is being underwatered then I shall give it more or at least more often. All the other plants along this border are doing well, so this mildew really stands out, although you can see I have some black spot on the rose although I don't use any chemicals, I pick the affected rose leaves off from time to time.
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