Garden Q&A: What is the best way to avoid blackspot on roses?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions
Garden Q&A: What is the best way to avoid blackspot on roses?

QUESTION

I want to avoid blackspot on my roses this year. On occasion, in your Garden Q&A, you've previously recommended copper sulphate. 

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