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#5- Oldies but Goodies
Oldies but Goodies
Trees have been a part of the outdoor landscape for thousands, maybe millions of years. Some tree varieties present in the early 20th century were susceptible to various insects and diseases which resulted in a shortened life span. Many new communities of homes were developed and the need for more trees increased. Various species were transplanted from their native planting sites and introduced to other areas of the country that were thought to have similar growing conditions.

Time is the best teacher in the nursery industry and time taught us many lessons. Insects and diseases can attack trees that are stressed due to the trees poor site selection and other growing conditions.

As a solution, plant breeders have introduced several new varieties of trees that are resistant to the insect and disease problems that trees have encountered in the past 80 years.

The following is a list of some of the improved tree varieties:
American Elm – most all existing Elms were wiped out in the 1960’s by Dutch Elm disease. ‘Morton Accolade’ is one of several new varieties that appear to be resistant to this deadly problem.

Sugar Maple – many older varieties tend to grow very slow in our clay soil and basically have a dull fall leaf color. Recent wet springs and summer drought have been the cause of many to have a short life span. ‘Fall Fiesta’ is a new variety which is fairly fast growing with great fall color and adapts well to our growing conditions including our heavy soil.

White Bark Birch Trees – have had a very difficult time adapting to our type of soil and our hot summers. They stress quickly, attracting borers that end the tree’s life.
‘Heritage’ River Birch is a tree with light brown bark that adapts very well to our growing conditions. This tree looks the same as the white bark birch trees except for the color of the bark.

‘Bradford’ Flowering Pear – was the first ornamental pear introduced in the 1950’s. For 20 to 30 years their popularity grew due to the trees glossy green leaves, great red fall color, white flowers, and its ability to provide shade to the house, patio or deck. The problem began as these Bradford’s got large. It was then that it was discovered that whole sections of these trees would snap and break due to the narrow crotch angles and the sail effect of the branches. ‘Improved Bradford’ was introduced by plant breeders who took away all the negatives of the original Bradford Pear but kept all the positives of this tree in tact.

Common Washington Hawthorne – is an ornamental tree which grows 15 to 20 ft. high and wide. They have white flowers in the spring and produces beautiful orange to red berries in the summer that birds love. It’s down side is that it’s vulnerable to the disease ‘Cedar Hawthorne Rust’ that deforms the fruit and no fungicide will do a suitable job. ‘Winter King’ is a newer cultivar that is very resistant to the disease and also has very attractive grey bark.

There are other tree varieties that also have a history of adapting well to our growing environment. Some of these include: Thornless Honey Locust, Carolina Silver Bell, White Fringe Tree, Hornbeam Carpinus, Red Maple, and ‘Green Vase’ Zelkova. You will find the majority, if not all the varieties listed at many of the local nurseries and garden centers.
DENNY MCKEOWN LANDSCAPING
DENNY'S GARDEN INFO
THE BLOOMIN NEWSLETTER