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Roses
Help please can anyone tell me why two out of my three roses have some brown blotches on there leaves all three are in pots in different parts of the garden. They are always well watered.
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Are they all the same variety? Some are more prone to black spot than others.
I have discovered a lot of black marks on my roses and did some reading:
Could be the Black Spot fungus. Could also be Downy Mildew, an algae that can damage leaves that remain wet for prolonged periods. The advice I read suggest adopting preventative treatments for both.
In either case, I think any plant will spend energy trying and repair damaged leaves. For this reason, I tend to remove damaged and infected leaves in favour of new healthy growth. The advice I read suggests to burn diseased cuttings.
Thanks Glen for the advice I've done that I will see how they come on they have plenty of buds. But I live on yorkshire moors so takes a bit longer to open.