Regal Prince OakWe love this narrow growing oak hybrid for its foliage, its color, and its hardiness, thriving in a variety of soil conditions. As plants grow, height will be 2 3 times more than width. So while plants will eventually mature at a substantial size, width is limited, making it a better option for the urban landscape than other heritage varieties. Leaves are a pleasant green with silvery undersides and remain clean until dropping for winter.