The plants are very winter hardy, capable of surviving temperatures twenty below zero with no noticeable problems but care must be given during hot dry summers. Every spring, I would ask my parents to take me to see the azaleas at the Arboretum, and for many years we made the annual pilgrimage. Unfortunately, most of the Knap Hill azaleas have disappeared over the past 40 years due to climatic stress, competition, theft, and disease. However, the memory of the azalea valley has remained with me, and below you will see some images from my garden at the family home where I have been raising and hybridizing Knap Hill azaleas since my college years in the late 1960's. Some Hardy Knap Hill Hybrids for the Middle Atlantic Region Cecile is one of the finest of the pinks.
Marina is an excellent soft yellow.
Chetco is one of the better new yellows. Gibraltar is the standard for brilliance in orange. Scenes From My Garden and Some of My Own Hybrids Marina and yellow Knap Hill seedlings growing among evergreen azaleas and wildflowers in my garden.