- Azaleas possess a slow-to-moderate rate of growth, reports the University of Arkansas Division of Agriculture. Eventually developing into an upright, oval formation, this plant typically grow as tall as 5 or 6 feet, although it potentially can reach twice that height. Careful pruning by gardeners can keep that height in check. Atop the long, bare stem of the azalea, one finds flowers arranged like balls in a variety of bold colors.
- The maximum growth rate of an azalea is achieved when it is planted in a cool site that receives partial sunshine. Some varieties tolerate sun to a greater extent than others, but nearly all demand sites that are not exposed to sessions of hot sun or drying wind. A careful balance is necessary, however, as azaleas planted in full shade will experience a lack of flowering and weakened growth. Planting them adjacent to the filtered sun of a tree like a pine is ideal.
- Azaleas have shallow root systems that are easily damaged by the presence of excessive water. The plant grows best in well-drained soil rich in organic matter and with an acidic pH level of between 4.5 and 6.0. Soil that is poorly drained denies the azalea necessary oxygen and stunts its growth. A lack of irrigation also contributes to the likelihood of the plant developing root rot. If it is necessary to place an azalea in a water-logged area, add compost to the surrounding soil to help ensure the survival of the plant.
- As compared to other shrubs, azaleas demand a minimal amount of fertilization; compost with shredded leaves and other organic materials will typically suffice. Signs that the shrub is suffering nutritionally include stunted growth, small leaves, dropping of leaves, and development of a light green or yellow color. Testing of the soil quality is recommended in order to determine if the growth rate of azaleas is being affected by the quality of the earth or other problems like disease, insect infestation, or hydration issues.
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