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My rather old roses (potted) look as though they are suffering from die back…but it seems I should have sprayed them with lime sulphur when leafless..is there anything I can do now? Should I keep on cutting off the bits that are turning brown and look dead? Should I just leave things alone and spray properly next year? They are flowering and look healthy otherwise.

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Remove foliage which is suffering and looking ‘brown and looking dead’. Leaves which are brown, look scorched on tips and edges means there is a deficiency of Potassium. You can add wood ash, manure or compost. Apply sulphur if leaves are pale with yellow veins. This time of year you should continue to cut off faded flower heads, trim off any twiggy growth. Keep up fungicide spraying to prevent black spot. Black spot can quickly defoliate a plant. This may also be an issue you are having. You can spray with Concentrates Yates Triforine Fungicide.

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