|Peter E. Girard worked mainly with the Knap Hill deciduous azaleas to produce new hybrids that are especially hardy, adaptable for containers and good in landscapes. Flowers are borne in huge, showy trusses of 20 to 40 blooms per cluster. This hybrid is hardy to -20 degrees F. Its leaves turn yellow to orange in fall.
The deciduous azalea is usually less picky about soil conditions, though it too prefers well-drained and acid conditions. Though azaleas have a potentially large list of possible pest and disease problems, they are usually trouble free if planted correctly in proper cultural conditions.