Rhododendron ( Satan Knap Hill Azalea )
Flowers are scarlet red , and in trusses of funnel - shaped blooms . Knap Hill / Exbury crossbreed are both English breed mark . They are unsloped , up to 6 feet tall and up to 6 foot wide . Trusses of up to 30 trump - shaped flowers , each to 3 inch panoptic , are borne in mid to later spring . The deciduous hybrid azalea , like it ’s aboriginal counterpart , is known for excellent fall colour and unsurpassed spring flowers ....