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Questions and Answers: 2019

Question: I want to use Ilex glabra 'Densa' as a hedge plant to block the road noise, but I wonder about …

• Question

  I want to use Ilex glabra 'Densa' as a hedge plant to block the road noise, but I wonder about its root system. Is the root system the kind I have to worry about in terms of damaging underground gas and water lines? How far from the lines should they be?

  Answer

  Dear Natalie, I spoke to our horticulture department and they have provided some important items that you will want to consider: Ilex glabra is a species that is used somewhat regularly as a hedge around utilities without concern. Spacing will depend a bit on the expected pruning regiment. For a more manicured hedge they are often planted closer together (approximately 3 feet) and pruned as needed to keep the shape desirable. For a more naturalistic visual barrier (as opposed to the formal hedge) you can pull them apart to 5 feet wide or plant a double row interspersing the rows 8 feet apart from each other. Spacing from the sidewalk will depend on the goals of the site. Would you like the edge of the hedge right along the sidewalk or want spacing to plant a herbaceous layer between the hedge and the sidewalk. The conditions of the site should also be considered, is this a high-traffic sidewalk? Lot's of dogs who might mark the plants if able would warrant moving the plants back a bit. If space on the other side of the hedge is limited it is suggested to push the hedge closer to the sidewalk. Five feet back from the sidewalk is a good distance to start with (unless there are features of your home that require otherwise). I hope this is useful.