Rhododendron atlanticum 'Marydel', commonly known as the Marydel Coastal Azalea or Marydel Dwarf Azalea, is a highly prized, naturally occurring hybrid selection of native deciduous azalea.

Renowned for its exceptional flower fragrance and compact growth habit, it was originally discovered in the wild near Marydel, Delaware, by the celebrated horticulturist Polly Hill. It is widely considered a natural cross between Rhododendron atlanticum (Coastal Azalea) and Rhododendron periclymenoides (Pinxterbloom Azalea).

This native azalea typically reaches 3-4' tall and 5-6' wide.  It prefers partial shade or dappled, high open shade.  Morning sun with afternoon shade protects the leaves from scorching.  It requires acidic, organically rich, humusy, and well-drained soils.

It will need consistent, medium moisture because it has a shallow, fibrous root system that does not like drying out.  However, it cannot tolerate wet feet, or standing water.

Host plant for the Brown Elfin Butterfly, the Azalea Sphinx Moth, and the Promethea Silkmoth.  

It is a vital source of nectar and pollen for several pollen-specialist bees, such as the Azalea Miner Bee, Andrena carolina, which has eeveolved to forage almost exclusively on early-blooming heath plants.