|Evergreen azalea developed by the USDA primarily for cold hardiness along the mid Atlantic States. H.H. Hume is a Beltsville Hybrid and has large, showy, hose-in-hose, white flowers with light yellow centers. Habit is upright, spreading, and is hardy at 0 to 10 degrees Fahrenheit. Bloom time is late April in warmer areas, and as late as early June where climate is cooler. Plant size ranges from tall and rangy to low and compact.
Plant as you would any of the other azaleas: high and in well-drained, acid soil, rich with organic matter. This is usually a back of the border azalea because most of the Glenn Dales are taller, though not all. Filtered light is best.
Do not be alarmed if plant drops some leaves during colder weather. 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.