This plant, commonly called oleander, is a beautiful shrub that can range in size from three to twenty feet, depending upon the variety. ‘Sister Agnes’ is white and can grow to twenty feet. ‘Little Red’ grows from three to four feet and makes a nice informal hedge. Oleanders need little water once established. The primary thing to remember about them is that all parts of the plant are extremely poisonous, so use caution in choosing a planting location.