Answer: Green Tower Boxwoods grow only 2-3 feet wide at maturity so I would space them 24" apart so they will grow into a full, dense privacy screen. You can place them 30" apart but they will take a little longer to fill in; closer and they will be crowded when they mature. I'd vote for using the chainlink fence. The shrubs will benefit from the additional light and air circulation a chainlink provides. Be sure to plant the boxwoods at least 12" away from the fence to give them adequate growing room. Enjoy your new hedge!
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