Which plant is most commonly used for hedging in gardens?

Buxus sempervirens, commonly known as boxwood, is one of the most popular choices for hedging in gardens due to its dense, evergreen foliage and ability to be easily shaped through pruning. This plant tolerates a range of soil conditions and can grow in both sun and partial shade, making it versatile for various garden settings. Its compact growth habit allows it to form a formal hedge that can define garden spaces or serve as a backdrop for other plants. The natural ability of boxwood to maintain its foliage year-round contributes to its appeal as a reliable and aesthetically pleasing option for garden hedges.

In contrast, the other options provided have different characteristics that may not lend themselves as effectively for hedging. Aesculus parviflora, or bottlebrush buckeye, is more of a large shrub and tends to have a more open habit, making it less suitable for forming a tight hedge. Berberis julianae, or wintergreen barberry, is thorny and may not provide the same polished, formal look associated with hedges. Callicarpa sp., or beautyberry, while attractive when in fruit, does not grow densely enough to provide a traditional hedge appearance.