Trees for Problem Landscape Sites
The Virginia Cooperative Extension Service provides this Trees for Problem Landscape Sites -- Screening page that has a wealth of information on choosing trees for screening. Although their list of recommended trees is not appropriate for all parts of the lower south, the info on planning and use of plants as screens is very appropriate. If offers a well-thought-out approach to plant selection that will also be very useful in selecting shrubs.
Favorite or New Plant
Butterfly bush (Buddleia davidii) is a must for gardeners wishing to attract butterflies. These shrubs produce gangly shoots that end in beautiful bloom spikes that are wonderfully fragrant and keep on coming all summer long. The blooms make great cut flowers, if you can talk the butterflies out of them. Plant buddleia in full to part sun, and plan on trimming back the spent bloom shoots once or twice during the summer to encourage a new flush of growth and blooms. Several varieties are available, offering an array of bloom colors including white, lavender, violet, purple, and yellow. Mites can be a problem in hot, dry locations during the summer months.