These moderate to fast growing, low maintenance evergreens were once the basic landscaping shrubs for regions with hot dry summers and mild winters. Narrow, leathery, semi-glossy, dark green leaves are attractive in all seasons. Flowers bloom late spring to fall clustered at branch ends. 'Sister Agnes' is the most vigorous of the oleander and produces single white blooms. Although plants may grow 20 ft. tall, they are usually trimmed at 6-10 ft. in height.