List Of Shrub

Gardening column: Watch shrubs, trees for wilt disease

Today we're going to tackle a couple of questions I've had lately and, with any luck, the answers will help many of you who have had plant problems like these and have wondered what to do:

Q: I have several viburnum shrubs that have been beautiful this year. They were covered with bloom in early spring and, even after the bloom faded, their attractive foliage still adds so much to my landscape. But one of them seems to be wilting and dying. The leaves are curled under, and at least half the bush looks sick. What is it, and what can I do about it?

A: It sounds as if your viburnum has contracted a fungal disease called Verticillium wilt. This disease lives in the soil and attacks hundreds of shrubs and trees a year. It infects plant roots through wounds and, in some cases, direct penetration of root tissue. Once the infection gets into the roots, it moves upward through the plants' vascular system, then plugs up and damages vital plant arteries, robbing stems, limbs and leaves of needed water and minerals.

The disease can also be spread by drought conditions, so keep the plant watered in dry weather.

Control is limited, as there are no effective fungicides available at this time.

If you don't want to remove the plant, there are a few things you can do to prolong its life:

♦Keep the plant as healthy as possible by amending the soil and fertilizing.

♦For the sake of appearance, prune off the damaged parts of the shrub and shape the rest.

♦If you do remove the plant, replace it with a Verticillium wilt-resistant plant. There is a list at this site: http://depts.washington.edu/hortlib/resources/ucdavis_verticillium.pdf .

Q: I have had a peony bush for 15 years or so. The last two seasons it has formed buds that never opened up. The plant looks healthy and green. Should it be dug up and replanted, or could there be a bug at work?

A: Since this reader's peony bloomed for 13 years and has been healthy other than no bloom for the last couple of years, we will assume it has no pest or disease problem.

One reason for no bloom could be the amount of sunlight has changed. Maybe another plant, shrub or tree has been added or grown larger and is shading the peony. In that case, the shading plants need pruning to allow more sun to reach the peony, or it's time to move the peony to a full-sun location.

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