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Wilting pelargonium leaves


i have two boxes of white pelargoniums, were doing really well (south east facing, watered only when it rains, good free draining soil with grit).
Then I noticed the leaves browning and dropping.
still flowering well, but the leaves were beautiful and now are not!
what is this disease?
Thanks.
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Posts
Looks like both! However, the brown dots on underside of leaves firm a little circular pattern, which looks a bit more like rust than oedema.
what a great site, Pansy! Will bookmark it.
with all this rain, I'm not surprised I have rust....and not best pleased. Not sure I even know how to treat it....
thank you so much, both of you.
Nooooo don't say that! The one thing I can't change is how much it has rained
I'm ok with insect pests, but fungal problems are a nightmare....
True, it does resemble both jo....I think I need to examine more leaves tomorrow. Thanks!
Oedema I think. The tan leaves especially. Nothing I can do about it then
Think I'd take off affected leaves in case it's fungal, and pot them up individually and move them somewhere under cover where they can't get rained on and you can control the watering.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Jo - yes it is - there are 4 plants, 2 in each box, alongside each other.
Dove (Hello!
) in an ideal world, where I had a house big enough to swing a cat, that would be exactly what I would do
but I haven't the room to store anywhere under cover. I have trimmed off all the bad leaves though. Strangely, it's still flowering beautifully, which makes me think it may be oedema, rather than rust, as the plant doesn't seem too bothered, for now...
Hello
What are you going to do with them when the cold weather hits? 
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Nothing
I always do nothing.
They are on a south facing windowsill and i'm in London, so it's never that cold.
I never prune them over winter, so the old, wrinkled foliage protects the plant. Then I cut ugly bits off in sprig once frost risk has passed.
Seems to work
Jo: you must have a point - I think I will repot in Spring, adding loads more grit etc, so that soil is even poorer and more free draining. Thanks!