The "Right Tree Handbook" says that nannyberry (Viburnum lentago) grows to 12 to 15 feet with a spread of 6 to 10 feet. The SULIS Plant Elements of Design Web information says 20 feet high with a 12-foot spread. So, not everyone agrees, as you've already discovered, but you can make your spacing decision with those numbers in mind. Imagine each of your nannyberries eventually spreading out 4 to 6 feet from the main stems and plan for the room they'll need. Planting 4 to 5 feet from the property line sounds like a good idea. They do sucker, and that is conducive to naturalizing and filling in the space for your hedge. The closer together you plant them, the sooner you'll feel as though you have a true privacy hedge. But from the plant's perspective, that may be too crowded for long-term vitality. The trick is trying to imagine the possible mature size. Careful site preparation, proper planting, and faithful follow-up care will make all the difference. Nannyberry should prove to be a moderately fast growing plant for you. A Michigan State University Web site claimed a growth rate of 12 to 18 inches a year.

Browse related Faqs by tag: horticulture, landscaping, ornamental shrubs