The USDA hardiness zona map for Maryland demo three hardiness zones within the res publica ’s border . Zone 5 is a lilliputian wedge shape in Maryland ’s mountains . Parts of the slide along the Chesapeake Bay are zone 7b ( the strong range of zone 7 ) . Zone 6 and the rest of geographical zone 7 are sandwich in between . Common flowers of Maryland may be unlike from one neighborhood to the next , due to clime and temperature range , yet all regions share certain plants that are hardy and uprise well .
Black-Eyed Susan
The black - eyed Susan ( Rudbeckia hirta ) , Maryland ’s body politic efflorescence , grow well in sunlight . It naturalizes well and the bloom keep their color for a long time . Vaughn Deckret of The Maryland Natural Resource says it should be on the top of the leaning for anyone who want to start gardening with native plants . Butterflies are drawn to black - eyed Susans , and goldfinches like the seed , he says . It blooms from mid - summer into declivity , and is hardy in all area .
Hardy Hibiscus
Plant breeder Robert Darby cross the first stout hibiscus in Maryland in the 1950s , breeding plant hardy to zone 4 , according to Jennifer Schultz Nelson in an clause for the University of Illinois Extension . He give his cross Maryland public figure : Lord Baltimore ( Hibiscus " Lord Baltimore " ) and Lady Baltimore ( Hibiscus " Lady Baltimore " ) . Lord Baltimore has large , dark - ruby flower and grows 4 to 5 feet tall ; Lady Baltimore is light pinkish with a dark center - geographical zone and grows to 4 feet . Although it ’s hardy to zone 4 , offer wintertime protection in zona 5 .
Butterfly Weed
Butterfly weed ( Asclepias ) is also native to Maryland . Vaughn Deckret call the plant " a butterfly stroke attraction , " noting that it is not strange to see several butterfly at once on the orange flowers . Butterfly dope flowers are lightly fragrant and bloom in May and June . A mature plant grows to 3 feet gamey . industrial plant in full sun and a well - debilitate soil . Butterfly weed is hardy in all areas of Maryland .
Russian Sage
Russian salvia ( Perovskia ) is often used in Maryland landscape , even institute in volume in highway median cartoon strip . The plant seems to thrive in the hot summertime ; the silver medal - unripe foliage and blue - purpleness heyday spikes give garden a cool feel . Russian sage blooms in summer and into downfall . It opt full sun and well - drained stain , and is fearless to zone 4 .
Cardinal Flower
Vaughn Deckret commend cardinal peak ( Lobelia cardinalis ) as a dear native for Maryland garden . It ’s magnificent red bloom spike attract hummingbird . Cardinal prime likes moist , equally - wet soil , and can tolerate some tone . It is hardy in all areas of Maryland .
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