Maine lies within United States Department of Agriculture ( USDA ) Hardiness zone 3 to 5 . While northerly parts of Maine experience cool , ironical summer and cold , dry winter , the coastal realm enjoy more restrained temperature throughout the year . If you live in Maine , quality flowering plants according to bloom color , bloom time , general civilisation and intended enjoyment . Various flowers grow well in Maine gardens during the summer .

Cut-Leaf Anemone

The cut - folio sea anemone ( Anemone multifida ) , also called the red anemone and the early Anemone cylindrica , belongs to the buttercup phratry ( Ranunculaceae ) and usually take shape loose clumps ranging from 6 to 20 inches tall . This sea anemone species features sleek , hirsute stem and green leaves that contain slightly toxic principle . Flowers bloom from May through August , featuring lily-white to blanch yellowish inner petals and green , purple or yellow outer petals . This perennial flower tolerates various lighting conditions , but prefers moist , gravelly soils . Maine gardener often use the cut back - leaf sea anemone in woodland garden .

Three-Leaf Goldthread

Three - foliage goldthread plant ( Coptis trifolia ) belong in the Ranunculaceae industrial plant crime syndicate and bear lissome , leafless stalk that reach up to 6 inches in height . Flowers appear from April through July , featuring single snowy to wan purple flowers with white stamen . The bright yellow , belowground stems were once used to treat oral fissure ailments . This perennial like moist , cold stain in suspect locations . Maine gardeners by and large apply three - leaf goldthread works in mossy timber area and swampland perimeter .

Roundleaf Sundew

Roundleaf daily dew ( Drosera rotundifolia ) are carnivorous plants that belong to the Droseraceae flora family . This sundew species feature flimsy stalks and white to light pink flowers that bloom from June through September . A moist , sticky substance causes insects to stick to the plant as the leafage close inwards to trap the fair game . This perennial needs wet soils in fully sunny positions . The roundleaf sundew perform well in Maine peat bog gardens and swamp margins .

Purple Joepyeweed

The purple joepyeweed ( Eupatorium purpureum ) , also sleep together as the sweet - sweet-smelling joepyeweed , belongs in the daisy syndicate ( Asteraceae ) and tolerates various ignition conditions . This recurrent features sparse , pointed leaves and stiff stems that achieve up to 6 foot in acme . with child , rounded flower heads sport many small , spark pinkish to lavender blossoms . These heyday bloom from July through September . ME gardeners often apply the imperial joepyeweed in moist woodland gardens and prairies .

Robert Geranium

The Robert geranium ( Geranium robertianum ) , sometimes call the herbaceous plant Robert , belongs to the Geraniaceae plant family . This summertime - flower annual bear green leaves that release a foul odor when offend or crushed . The Robert geranium blooms from May through October , sport paired , pale regal or pinkish peak on top of cherry , hairy stem . This efflorescence plant performs well in Maine woodland gardens .

Cup Plant

The cupful flora ( Silphium perfoliatum ) belongs to the aster family ( Asteraceae ) and ranges from 3 to 6 foot in height . This perennial earned its name because the leave come together at the stalking to make a petty cupful . pee collect in the cup and attracts pollinator . Flowers add people of color to Maine garden from July through September . The blossom top dog consist of 20 to 30 yellow blossoms with deep yellow midpoint disks . Cup works prefer blotto soils that receive plenty of sun . These prime crop well in hummingbird gardens , moist woodland areas , butterfly garden and prairies .

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