Foster Holly TreeFoster Holly Tree for Sale Online Foster Holly (Ilex x attenuata 'Fosteri'), also known as Foster's No. 2 Holly, is a compact evergreen tree with bright red berries and glossy green foliage. Holly trees are excellent for use as privacy screens and hedges but also make wonderful specimen trees. Foster Holly trees add year round interest to any landscape and their fruit attracts birds well into winter. The Foster Holly grows at a moderate rate and can