Topping a Hemlock - Knowledgebase Question

Glen Ridge, NJ
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Question by lelkner
January 20, 2006
I have a question about 5 Hemlock trees in our suburban backyard that have been topped by the previous homeowner or possibly the town. The reason for doing so was that the growth of the trees was interfering with the electric/phone/cable wires. I have been told that topping Hemlocks will eventually kill them and we should have them taken down. They are quite big in spite of topping and provide a lovely privacy screen. Any ideas/advice on whether or not we should take them down and plant something else? They still get new growth and apart from looking a bit silly, they appear healthy. We do loose some large branches in windy or winter weather conditions. Thanks for your time.


Answer from NGA
January 20, 2006
Hemlocks can sometimes be maintained as a clipped hedge, so they may survive for quite some time if trimmed regularly to maintain a steady height. However, if the sudden topping left raw cuts across heavy branches and broad trunk wounds, these will be an open invitation to pests and diseases, and as a result they may not live terribly long. (Topping in general is stressful and also destroys the shape/natural strength and natural defenses of any tree.) Another consideration with hemlocks is that they are being attacked by a pest called the hemlock wooly adelgid over a broad area including the mid-Atlantic region. When these appear, they require frequent spraying to control or else they will kill the hemlock pretty quickly. All in all, I think you will probably be forced to replace them sooner or later. When you do, keep in mind the mature height of the replacement plant so it will fit comfortably under the wires when it reaches its mature height. I'm sorry I can't be more encouraging about the hemlocks for you.

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