Many species of garden perennial bear fragrant flower , but a smattering of them remain tried - and - true perennials for landscape in USDA Hardiness Zone 5 – where wintertime humiliated temperature usually set down to -10 to -20 degree F annually . Always take modern varieties of perennial that explicitly note flower or leafage scent as being a primal ornamental feature on their labeling . Often complex fosterage lead to loss of sweet-smelling flower petal while ameliorate disease resistance or plant vigor .
Peony
Herbaceous paeony ( Paeonia spp . ) , those that do not turn woody stems and pass away back to the ground each winter , bear declamatory , frilly and flossy efflorescence heads of pink , white or violent in spring . Most varieties bear a powdery unfermented scent , resembling the fragrance of wild rose .
Hosta
Typically , hosta or plantain lily ( Hosta spp . ) grow in shaded garden where its leaf is admired . Most hoi polloi cut off the tall flush spikes that pass in summer , perhaps never enjoying the sweet aroma that permeates the aura from the lavender or white vasiform blossoms .
Lily of the Valley
honeyed odor drift from the midget white flowers of lily of the valley ( Convallaria majalis ) in spring . A clumping ground cover that grows from rhizome roots , the large glossy green leaves persist pretty until autumn . This is a perennial for shady areas where soil remains moist and rich in constitutional matter , perfect in charming woodland glens and garden beds among fern and hosta .
Bearded Iris
With hundreds of assortment with flowers ranging in all colors except ruby-red carmine , bearded or German iris ( Iris spp . ) typically let out a sweet or spicy sweetness from the center of their unambiguously mould flower . These plants flower anytime from mid to late outpouring and develop into large massing chunk of fan - like , lance - like foliage .
Garden Phlox
Sometimes call summer phlox to speciate them from the low - growing phlox that blossom earlier in spring , garden phlox ( Phlox paniculata ) bears noodle - like bloom heads on root tips in midsummer . quondam variety show of garden phlox often yield gently dulcet - smelling flower , but some innovative hybrid retain the scent . These traditional perennial prosper in the mild summers and cool soils find in Zone 5 gardens .
Lilies
For particularly fragrant lilies , focus on growing wild - species types . Regal lily ( Lilium regale ) , Lilium speciosum , Lilium pumilum , Lilium hansonii , nod lily ( Lilium cernuum ) , meadow lily ( genus Lilium canadense ) and golden - rayed lily ( Lilium auratum ) produce sweetly scented peak . Be thrifty about choosing Lilium pomponium and common Turkscap lily ( Lilium martagon ) , as their recurved petals emit an arguably " ill-smelling " smell . Madonna lily ( Lilium candidum ) and Formosa lily ( Lilium formosanum ) produce magnificently fragranced blooms , but neither is faithfully winter hardy in Zone 5 .
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