Top Questions About Viburnum Shrubs

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Questions About Viburnum Shrubs

Asked by
Anonymous on
March 10, 2011

Q. 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?

Answered by
Nikki on
March 11, 2011
Certified Expert
A.

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

Q. Does Chicago Lustre Arrowwood Viburnum Need Cross Pollination

Does Chicago Lustre Arrowwood Viburnum need cross pollination?

Answered by
Heather on
April 1, 2011
Certified Expert
A.

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

Q. why won’t my viburnum flower?

Why won’t my viburnum flower?

Answered by
Heather on
May 3, 2011
Certified Expert
A.

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

Q. 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.

Answered by
Nikki on
May 14, 2011
Certified Expert
A.

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

Q. 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.

Answered by
Heather on
May 22, 2011
Certified Expert
A.

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

Q. 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?

Answered by
Nikki on
June 15, 2011
Certified Expert
A.

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

Q. 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?

Answered by
Heather on
July 11, 2011
Certified Expert
A.

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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