North Dakota has only two hardiness zones–3 and 4 . wintertime temperatures in both zones can get well below zero , and while gardener ’s in North Dakota may not have as wide a option as gardener just to the south , the flowers that will thrive there are some of the stalwart . opt a vine for a trellis or along a fencing , a shade - loving plant that goes well under tall trees and taller plant for the centerpiece of the garden .

Black Bugbane

Black bugbane ( Cimicifuga simplex ' Brunette ' ) grows from 59 to 70 inches tall with a bedspread of 23 to 29 in . The industrial plant blossom from ahead of time to late tumble , takes three class to reach maturity and produces large , majestic - mordant leave of absence and spindle of fragrant , pallid - pink flowers . Plant black bugbane in full Lord’s Day in the cooler area , fond shade in hotter sections and in an fair , dampish stain . smuggled bugbane is deer and coney tolerant and is hardy in geographical zone three to nine .

Dutch Crocus

Dutch crocus ( rocus spp . ) , also known as bounce crocus , is a member of the lily family line . Crocus grow from corms – an underground root that resemble a bulb . The plant produces grass - like leaves , and from one to six little , wine - glass shaped flowers in solid colour , stripes or bismuth - colored person . Crocuses can be either spring or fall blooming . Plant crocus in full Dominicus or fond shade . The prime are hardy in zones three through eight .

Dutchman’s Pipe

Dutchman ’s organ pipe ( Aristolochia macrophylla ) is a deciduous vine that grows from 20 to 30 feet long with deciduous , average - light-green , heart - shaped leave that mature from 4 to 10 in long . diminished , yellow , pipe - shaped flowers bloom in May and give way to brownish yield that ’s 2 to 3 inches long . Plant Dutchman ’s pipe in full sun or fond shade and in a moist , well - drained grime . The flora is hardy in zone 4 to 8 .

Lenten Rose

Lenten rise ( Helleborus orientalis ) is a appendage of the goldcup or crowfoot crime syndicate that grows from 16 to 20 column inch high . The plant sport sullen - dark-green leave-taking that grow up to 18 in long and 16 inch wide . The ashen , pink , rose or purple flowers grow from 2 to 3 inch across , grow in clusters and bloom in the wintertime . Plant lenten rose in fond - to - full shade and in a moist , well - drained soil . The works is dauntless in zona 4 through 9 .

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