I am planning to plant a curved internal hedge in my garden, about 3ft high and 100ft long, to divide the space. Although I am in a rural location and most of the trees and boundary hedging are native in style, I want this hedge to be evergreen and fairly formal, as a contrast, and as a backdrop to other plants. I’m nervous that box might be too “stiff”. I would love common holly, but will it be possible to maintain it at this size? Any other ideas?