Leyland cypress trees suffer from fungal diseases and other maladies, especially when planted too close together. Photograph by Timothy Daly, UGA Extension Gwinnett. |
One of the most
widely planted trees in landscapes across Georgia is the Leyland cypress. It
has many appealing qualities, such as its pyramidal shape, attractive dark
green foliage, and a rapid growth rate.
The tree can be used as a screen to block unwanted views and enhance
privacy. Despite its virtues, the plant frequently performs poorly in the
landscape as a result of improper planting practices.
Leyland cypress
trees can grow 50 to 70 feet high with a spread of 15 to 20 feet. However, they are usually planted too close
together. The trees should be at least
10 feet apart, preferably 12 to 15 feet apart, and a minimum of 15 feet away
from structures. Planting at this distance doesn’t make them a useful screen
for some time. However, they can grow four feet per year in height and two to
three feet in width. In three to five years, they will be effective screens. If
waiting a few years is not right for you, the trees can always be planted
closer together with the understanding that every other one will have to be
removed in time. You can also plant
other evergreen plants such as arborvitaes, Japanese cryptomerias, wax myrtles,
or certain types of hollies as an alternative to the Leyland cypress. They form
effective and attractive screens also.
Leyland cypress
trees need to be planted in locations that receive full sun. The shade will
reduce their vigor and cause the leaves and branches to thin out. The trees
require fertile, well-drained soil. One of the most critical factors in the
growth of Leyland cypress is making sure they are adequately watered.
Inadequate amounts and also excessive amounts of water will cause Leyland
cypress trees to suffer and decline.
Leyland
cypress trees can become infected with a couple of stem canker diseases caused
by a fungus. The primary symptom is the foliage on the top of the lateral
branches turning yellow or brown. The
disease can potentially disfigure or kill the trees. Prolonged dry conditions
and being planted too close to each other have contributed to the development
of these diseases. Since there are no effective chemicals for control, the best
way to treat an infected tree is to prune out the dead branches. Cut below
where the canker has formed on the branch and sterilize the pruning tool in
alcohol or bleach before making the next cut to prevent the spread of the
disease. If trees that have been extensively damaged or if the trunk itself is
infected, they should be cut down. Also, during dry spells, make sure the trees
receive the proper amount of water, which will reduce the development of the
disease.
Leyland
cypress trees can be a great addition to the landscape if properly planted and
maintained. However, this tree is rapidly becoming one of the most troublesome
trees in the landscape. Due to improper planting and overuse, Leyland cypress
may go the way of plants such as the Red Tip Photinia. This small tree was
planted extensively in the 1970s and 80s as a hedge, but eventually, a fungal
leaf spot disease caused many of them to die out.
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