Trees can play an important role in the conservation of energy. It is estimated that along with insulation, storm windows and weather stripping, they can save 20 to 25 percent of the increasingly high cost of heating and cooling the home.

Fall is one of the best times to plant most kinds of trees. However, the willow oak, tulip tree and evergreen magnolias are best planted in the spring when new root growth will soon supply moisture to the branches.

Evergreen trees can be used to break winds during the cold months. Deciduous trees can shade the home during the summer months, and after the leaves drop in the fall, the warming rays of the sun will help heat the building during the winter.

If you are thinking of planting a shade tree and don't know what kind to plant, recommendations from the Ohio Agricultural Research and Development Center, Wooster, can be helpful. The recommendations stem from 10 years of painstaking evaluation of more than 140 species for urban use.

Norway maples are very tolerant to city conditions and one of the best is the Columnar Norway maple, according to the research report. It can be used where there is not a lot of room, grows twice as high as it is broad, grows relatively fast, 2 feet per year, and is easier to transplant than many of the others.

Bloodgood London Planetree (sycamore) is a fast grower. When planted the tree was 10 feet tall, and after eight years of growth it was 23.6 feet tall, 15.3 feet in diameter with a trunk diameter of 6 inches. It has a mature height of around 70 feet and is very resistant to anthracnose, a disease of American sycamores. It has no fall color.

Select Callery Pear has beautiful white flowers in the spring and excellent fall color. It bears a limited amount of fruit which are quite small and hold well into the winter. Litter is not a problem since most of the fruits are eaten by birds. After nine seasons it grows from a 4-foot seedling to a 22-foot-high tree with a 10-foot-wide crown. Since it is about twice as high as broad, it is ideal for planting in a confined area. It had no serious insect or disease problems in the evaluation plot.

Red Sunset Red Maple has a bright orange-red fall color which occurs before killing frost and is generally effective for one or two weeks. This is considered the best red maple selection for urban and suburban planting.

Dwarf Korean Callery Pear is an excellent small tree with an ultimate height of about 20 feet, has excellent white flowers, glossy green foliage and outstanding red fall color. It is disease and insect free and the fruit is sparse and small.

London Planetree is a rapid growing, pyramidal tree widely adapted to the downtown. It is very similar to Bloodgood London Planetree which is a cultivar of this species. It is somewhate susceptible to authracnose but much less so than the native sycamore.

Snowdrift Crabapple is a round-headed, broad, oval tree. The foliage is highly scab-resistant, its straight trunk has limbs to street tree heights, produces abundant white flowers in the spring, and its small fruits do not create a maintenance problem.

Marshall Green Ash is a very vigourous seedless tree which transplants easily, is expected to reachh 55 to 60 feet a maturity, and has bright yellow fall color.

Greenspire Linden as a young tree has an upright oval form with small, dense, dark green foliage. In city plantings it does very well under difficult conditions. Crotch development is good in this medium-textured tree.