|Ilex cassine is seldom seen in the garden, but is significant because of all the wonderful hybrids between it and Ilex opaca, the American holly. The Dahoon holly is a small evergreen tree that grows to about 20 feet tall and 10 feet wide (larger in the wild). It thrives in zones 7 to 9 and has either yellow or red berries. In the wild, you will find this plant growing in moist woods. 'Ivory Tower' is an upright female cultivar with ivory-white fruit that ripens late in the year.