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Over ten years, Gerry Daly answered more than 5,000 gardening questions. His knowledge is based in science and practical experience, and by working on radio and television. Access to the advice database is open

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Questions › Author "mary-catherine"
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Overgrown Griselinia Hedge
My next door neighbour has a Griselinia hedge on both sides of her back garden. Both are at least 3 feet wide. If it’s cut back by half or even two thirds, will it sprout again, and if so when would be the best time to do it.
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Canker on Prunus

I now think my Prunus serrulata 'Kiku-shidare-zakura has canker, as there is a gummy ooze on some branches. Do I cut them out now or wait until June?

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Pruning Prunus

Any tips on preventing disease when pruning prunus?

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To prune a prunus?

The attached photo is of my 20 year old Prunus serrulata 'Kiku-shidare-zakura' growing outside my kitchen window. I trim it every summer to keep it compact as my garden is small. I'm tempted to remove the side branch as that is now getting quite heavy. What is your advice.

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Crustaceans on my blackcurrants

See attached photo of what looks like a small brown crustacean on my wisteria. The branches of my blackcurrents were also covered in these. When picked off, the surface underneath them is slightly white. The inside of the crust is covered in a minute amount of whitish powder.

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Blackfly problem on Prunus Serrulata

My Prunus Serrulata 'Kiku-shidare-zakura has been badly attacked by blackfly. A lot of it is dying. What should I do?

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