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Over the years, Gerry has answered more than 5,000 of your gardening questions. His knowledge is based in science and practical experience, and by working on radio and television.
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I transplanted red dogwood I found in the bog earlier this year. It started to grow and looked well, new leaves and all. Now leaves are turning black on some plants and all the green vegetation is blackening on those sick plants. I am afraid it might spread - what ever it is?
I've a syringa vulgaris lilac bush that is not in great soil. While its healthy, its struggling to grow. I have it about 5 years and want to transplant it to a better area. It's nearly 4ft tall. Would replanting damage it and do you know what type of soil would be best? I'd like to do it now that the flowers have died off. Thanks!
I have a Robin Red and a golden maple next to each other. Both are covered in a tiny black insect. On the maple the insect appears like black spots on the leaves. On the Robin Red the insects are grouped on the stems. What is the best way of treating this? Thank you.
I'm planning a new build the site has been chosen (not in Dublin) but there are approx 150 year old, 50-60 foot tall beech and chestnut trees on the site, could you recommend a safe distance the house should be from these trees root wise? Going at least the height of the trees from the house anyway.
The new growth on red robin plants are inclined to sag forwards and downward to the ground. My question is, should I stake them upright with bamboos before trimming the side of the hedging, or trim as they are. The only thing is if I trim as is, I will be cutting approx. 12 to 18 inches off any plants growing tip that's leaning forward and down. It is a relatively new hedge and is only 3 feet in height and I wish it to grow up to 10 feet. Also, there is a dividing blackthorn hedge directly behind it, will it hinder/impact the red robin in any way? Is it necessary for it to be removed at this stage or can this be done later?
Bamboo trouble. I bought two pots of bamboo at Woodley, it seems to be fading fast. I water it and fertilise it. Leaves turning brown... is it that I need bigger pots .
i keep finding this white stuff on dead plants in my indoor garden. Is that what is killing my plants? Please see photo attached
A few years ago I set Photinia Red Robin and Pink Marble hedge mix of 2:1 respectively. Unbeknownst to me, the Red Robin is a quicker grower and has crowded out the Pink Marble and as a result there are slight gaps where the Pink Marble is.Should I leave things as they are or should I replace the Pink Marble for Red Robin in the autumn? Is there anything you could suggest to help the current issue? Also, in your opinion which is the best fertilizer to use and when. (I used well-rotted horse mature spring 2014 and it seemed fine)
I planted some hoheria trees last year but the leaves have some type of fungal disease. There are small black spots on the underside of the leaves, the leaves turn yellow and fall off. I sprayed with Rose Clear Ultra and it definitely helped but the problem seems to be returning again. Do I need to keep spraying or should I replace the trees? Any advice would be appreciated. thanks.
Need help in selecting a boundary for shelter in our garden in a very exposed area of North Kerry, in the countryside approx. 7km from the sea/coast. I don't want it to grow too high, would like to keep an open feel to the area but creating a shelter belt with little maintenance is paramount something frost hardy. There is a ranch railing running along the boundary presently on that side (westerly side) of the house and i have a border of approx 2ft width of soil to work with inside the fence and outside the gravel drive way. On the other side of the house I have a ditch with 2ft border inside it to work with, need something that will provide shelter and will create a balance with the other side. Both sides are approx 15m away from the house. Hope you can help.
My wisteria grows beautifully and looks very heathy and green but very few flowers appear.it is on a south-facing wall on the back of the house.Any ideas what I can do?
I bought a wisteria plant 3-4 weeks ago. Want to grow it in a pot so bought a good big one but the leaves are turning brown and the plant is not growing.Wonder if the cold weather has anything to do with the fact that it is not doing well. Thank you.
My 5 year old camellia (potted) started budding for the first time this year. However the leaves and buds have turned brown.
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