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I have a buxus in a pot and it's been fine for over a year but it's turned brown and looks like it's dying also my clematis and one of my other shrubs has white powder all over  it any ideas please 

Busy-Lizzie

The buxus could have box blight and the clematis could have powdery mildew. One of mine has it, I cut it down last year and sprayed the new growth with a fungicide but it's happened again. I've read that it can happen if the plant gets too dry, but mine has been well watered. It maybe because it's on a north wall in shade. Perhaps this will help https://www.rhs.org.uk/advice/Profile?pid=253

hogweed

Or perhaps the box has been short of water.

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