Tree Quercus palustris 'Emerald Pillar' [sold as Green Pillar®] [Green Pillar Pin Oak] This cultivar is a columnar habit, great for those smaller spaces. Its fall color is a vibrant red, which leads many to believe that the Scarlet Oak, (Quercus cocinea) is in the genetics of this cultivar. Green Pillar Pin Oak is grafted onto root stock, so graft incompatibility may be an issue in the future. Requires an acidic soil and is subject to severe iron chlorosis on calcareous soils. This can be corrected but it…
Tree Quercus robur × bicolor 'Nadler' [sold as Kindred Spirit®] [Kindred Spirit Hybrid Oak] 'Nadler' is a cultivar with a tight columnar form branching from the ground, adapted to many soil types, and a yellow-brown fall color.
Tree Quercus robur 'Fastigiata' [Columnar English Oak] The tightly columnar 'Fastigiata' provides a strong vertical accent, and is far more popular in the Midwest than the straight species. Powdery mildew on the leaves can be a significant problem. Seed propagated 80-90% true to type, thus variation can also be a problem.
Tree Quercus × warei 'Long' [sold as Regal Prince®] [Regal Prince Oak] The Regal Prince Oak is notable for its resistance to powdery mildew and borers, strong vertical, columnar form, and tolerance to wind and ice. Holds its dense, fastigiate form into old age.
Shrub Taxus × media 'Anthony Wayne' [Anthony Wayne Anglojap Yew] 'Anthony Wayne' is an interesting columnar, female cultivar that has strongly upward growing shoots tipped with bright green new growth. Withstands nearly any amount of pruning. Black vine weevil can be a problem, but this is rare. Newly planted yews do not perform well in poorly drained soils. Perhaps overused in the urban landscape. Can be severely damaged by deer.
Shrub Taxus × media 'Hicksii' [Hicks Anglojap Yew] 'Hicksii' is a columnar cultivar with both male and female forms. Withstands nearly any amount of pruning. Black vine weevil can be a problem, but this is rare. Newly planted yews do not perform well in poorly drained soils. Perhaps overused in the urban landscape. Can be severely damaged by deer. Dioecious.
Shrub Taxus × media 'Viridis' [Columnar Anglojap Yew] 'Viridis' is a narrow columnar cultivar with bright green, twisted needles that emerge bright yellow-green in the spring. Withstands nearly any amount of pruning. Black vine weevil can be a problem, but this is rare. Newly planted yews do not perform well in poorly drained soils. Perhaps overused in the urban landscape. Can be severely damaged by deer. Dioecious.
Shrub Thuja occidentalis 'Holmstrup' [Holmstrup Eastern Arborvitae] 'Holmstrup' is slow-growing and compact with a narrow pyramidal habit and good winter color. Bagworms can be a problem. Subject to several other insect pests, all of which usually can be controlled with timely spraying. Deer may feed on foliage.
Shrub/Tree Thuja occidentalis 'Smaragd' [Emerald Green Arborvitae] 'Emerald' is a very narrow, tight pyramidal cultivar that maintains excellent vertical sprays of bright, emerald green foliage throughout the year. Very heat tolerant and cold hardy. One of the best plants for screening in moist, well-aerated soils. Bagworms can be a problem. Subject to several other insect pests, all of which usually can be controlled with timely spraying. Deer may feed on foliage.
Shrub/Tree Thuja occidentalis 'Wintergreen' [Wintergreen Eastern Arborvitae] 'Wintergreen' has a narrow pyramidal habit and maintains excellent color all year round. Slightly faster growing and more shade tolerant than other variants of T. occidentalis. One of the best plants for screening in moist, well-aerated soils. Bagworms can be a problem. Subject to several other insect pests, all of which usually can be controlled with timely spraying. Deer may feed on foliage.
