Viburnum Shrubs

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  1. Leaf Curl Problem on Viburnum
  2. Does Chicago Lustre Arrowwood Viburnum Need Cross Pollination
  3. why won't my viburnum flower?
  4. Viburnum Not Leafing Out
  5. Viburnum
  6. Viburnums – No Blooms
  7. Why Are the Leaves on My Virburnums Turning Red?
Asked by Anonymous on March 10, 2011
Leaf Curl Problem on Viburnum

For two seasons, when the leaves develop, leaf curl sets in and has damaged a viburnum shrub. It looks like grey aphids (?) may be causing this. Can I prevent it? How do I treat it?

ANSWERS
Nikki
Certified GKH Gardening Expert

We have seen a lot of success with using neem oil on aphids. We would recommend that you try that. Here is more information that will help you:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm

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Asked by Clovie on April 1, 2011
Does Chicago Lustre Arrowwood Viburnum Need Cross Pollination

Does Chicago Lustre Arrowwood Viburnum need cross pollination?

ANSWERS
Heather
Certified GKH Gardening Expert

It should not unless you plan on getting seeds. Even then, they will produce seeds without cross pollination, but will produce more seeds with cross pollination. Your average owner is not aiming for that. Here is a nice discussion about this fact for you to read if you would like:
http://forums2.gardenweb.com/forums/load/shrubs/msg021358308743.html

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Asked by danny7 on May 1, 2011
Why Won’t My Viburnum Flower?

Why won’t my viburnum flower?

ANSWERS
Heather
Certified GKH Gardening Expert

There are many reasons a plant does not flower. It may not be getting enough light, it may have too much nitrogen, it may not have enough phosphorous or it may have pests.

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Asked by Anonymous on May 13, 2011
Viburnum Not Leafing Out

I am in Wisconsin, Zone 4. Last fall in October I moved several viburnum shrubs. One of them is not leafing out, yet the stems after cutting are green, so the shrub is not dead. There is no growth coming up from the bottom of the shrub. Is this a lost cause? I did cut it way back this week.

ANSWERS
Nikki
Certified GKH Gardening Expert

Since the stems still show signs of green, it is still alive and should begin leafing out given some more time.

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Asked by blt1301 on May 21, 2011
Viburnum

I purchased a vibunum plant a couple of years ago. It has never blossomed. Are there different sex plants, like holly, that are needed to bloom? It’s planted in partially shaded location.

ANSWERS
Heather
Certified GKH Gardening Expert

Some varieties do have male and female plants. You need to find the botanical name and then you can confirm if it is one of those varieties.

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Asked by Anonymous on June 14, 2011
Viburnums – No Blooms

I have three viburnums that were selected and planted by a well-respected local nursery. Since they were planted, they have rarely bloomed — two have never bloomed, and one has has one small bloom on two occasions (although, the foliage looks very healthy). I have never pruned them, but have tried soil supplements (like Holly Tone) as recommended by the nursery. I am told that the plants are too comfortable where they are and that they need phosphorous. Can you help?

ANSWERS
Nikki
Certified GKH Gardening Expert

If your viburnum doesn't bloom, it could be because the species you have planted isn't appropriate for your growing zone. Too much fertilizer that is nitrogen-rich can also discourage viburnum from blooming. The age of your plant can be another factor. If the plant is too young, it might not be ready to bloom. They also need lots of sun.

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Asked by panini on July 5, 2011
Why Are the Leaves on My Virburnums Turning Red?

My viburnum bushes appear to be dying or are infected. The leaves are turning red/brown, falling off and dying, and branches are weak at base of plant, falling off as well. I was told it might be infected with a borer. What is a viburnum borer? Could this be responsible? How can I get rid of it? Will cutting off the infected branches help? I have sprayed with an insecticide containing permethrin. Will that help?

ANSWERS
Heather
Certified GKH Gardening Expert

The leaves are turning red due to something killing it and it could well be a borer issue. Here are more information about them and their control:
http://www.mortonarb.org/trees-plants/tree-and-plant-advice/help-pests/viburnum-crown-borers

It may also be a fungus, which can be treated with a fungicide.

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