Sandys Nursery Online Ilex Nellie R Stevens' Evergreen Holly Shrub Trade Gallon Pot Growth Habit: Fast growing pyramidal evergreen tree or shrub. Growth Rate: Fast; up to 3 feet per year once well established. Spacing: Wind or privacy screen 5 to 6 feet apart. Mature Height: 15-20 feet. Mature Width: 10 feet. Spacing: Wind or privacy screen 5 to 6 feet apart. Ships: (1) Trade One Gallon Pot well branched.