Garden Q&A: At what strength should I use copper sulphate?

Whether you're a gardening beginner or expert, Irish Examiner columnist Peter Dowdall has the answer to your questions
Garden Q&A: At what strength should I use copper sulphate?

Question

I found some copper sulphate in a shed. I would like to use it on my box pyramids. How much water should I use per ounce of copper sulphate?

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