Some trees are superior to others for city planting. To determine which are best, Ohio State University specialists spent 10 years studying and evaluating 140 species, and compiled a list of the top 20. The first 10 were published on the garden page last Sunday. Here are the others:
Silver Linden (Tilla tomeniosa) is No. 11 on the list of 20 shade trees most suitable for urban planting. It is a large, rounded species that can be accommodated by only the widest tree lawn. As with most lindens, it varies in unformity and growth rate. The whitish foliage underside and excellent yellow fall color are very attractive.
Festival American Sweetgum (Liquidambar styraciflura 'Festival') is a fast-growing tree with a final height of 60 feet. It displays excellent lustrous green foliage and many fall colors (reds, greens, and yellows) on the same plant. The tree is structurally sound, strong and stable.
European Linden (Tilia europea) is a fast growing tree with a pyramidal habit when young. The tree should reach a height of 60 feet. The leaves are large for a linden and it appears to be suitable for most urban plantings.
Moraine Sweetgum (Liquidambar styraciflura 'Moraine') is uniform and fast growing. It has an upright oval habit with a medium branch texture and very glossy foliage. The red fall color is excellent and crotch development has been found to be good.
Hessei European Ash (Fraxinus excellent 'Hessei') is a very vigorous upright oval, seedless cultivar. Pests common to ashes have not been observed on this selection to date. The branch texture is medium to coarse and crotch development is good.
The foliage is glossy green and is retained late in the fall. Its considerable size limits its use to large areas.
XP110 Littleaf Linden (Tilia cordata 'XP110') is an upright oval cultivar with attractive small foliage.
Rancho Linden (Tilia cordate 'Rancho') is a new upright oval cultivar. As a shade tree, it requires little maintenance. In addition to a medium-finebranch texture, it has attractive, small, glossy green foliage.
Hedge Maple (Acer campestre) is a round, slow-growing species. As a young tree, it may be irregular in habit and somewhat difficult to train to a single stem, but it develops a shapely formal, rounded crown with age.
This tree has medium branch texture. In addition, it is usually pest-free and fairly tolerant of dry soil conditions. It has dark green foliage and an excellent yellow fall color.
Hardy Rubber Tree (Eucommia ulmoldes) is a small tree with an ultimate height of 25 feet. It is extremely drought resistant, displaying dark glossy foliage during the driest Ohio summers. Urban plantings throught that state have been successful.
This tree appears well-suited for the inner-city environment as well as being resistant to diseases and insects.
Tilford Red Maple (Acer rubrum 'Tilford') is an upright spreading cultivar and a vigorous grower when young, assuming a rounded form with maturity. This medium-textured specimen requires little maintenance in city plantings.