delineate on the USDA Plant Hardiness Map as a belt beginning in west Texas , covering most of the mid - south and ending in the mid - Atlantic commonwealth , temperatures in Zone 7 arrive at a minimum of 0 stage F. This realm experiences immobilize but compare to northern nation , has short , mild wintertime . Many azaleas , which are part of the Rhododendron family , are hardy in this region , are evergreen and bloom in mid - outflow , according to the 1997 " Sunset National Garden Book . " azalea expand in acidulous soil and most prefer partial Sunday .
Gable Hybrids
Hardy in Zone 7 and some of the warmer parts of Zone 6 , Gable hybrids let in the shining pinkish Caroline Gable , purple Herbert and white Rose Greeley . Plants are heavyset , have dense leaf and shiny leaf , and are fertile bloomers . If planted in the coldest parts of Zone 7 , Gable hybrids may miss some leave during winter . Plant in partial sun and keep soil moist during maturate season .
Glenn Dale Hybrids
Hardy in Zone 7 and developed specifically as cold - weather condition plant , Glenn Dale hybrid let in the orange Anchorite , pale pink Aphrodite and white Glacier variety . Some plants with bi - colour flower , including Geisha ( white with red stripe ) and Martha Hitchcock ( magenta march with white ) are also useable . These plants vary in look from improbable and twiggy to moo and heavyset , but most opt partial Lord’s Day and moist territory .
Greenwood Hybrids
Though not cover for Zone 7 temperatures , Greenwood hybrids can outlive temperature down to 0 degrees F if kept blotto . Varieties admit the pink and purplish Greenwood Rose , deep red Sherry and white Sleigh Bell . These plants are unique for their large , double bloom . Plant in partial sun in the coldest parts of Zone 7 and fond shade in fond localisation and keep moist , particularly when temperature drop .
North Tisbury Hybrids
Best sleep with for their late blossom season , the North Tisbury Hybrids let in Pink Cascade , Red Fountain and Alexander , which has orange - red blooms and foliage that turns to a showy bronze in the dip . These low plants spread , making them good candidate for ground cover and they do n’t blossom until mid - summer . In hanging basket , these plants will cascade down . Plant in fond sunshine and keep soil moist .
