Perennial Honesty Plant (Lunaria rediviva); unlike the annual version that's unscented, this one has strongly fragrant flowers in spring followed by transparent fruit. Best grown in clumps of 5 plants. Grows well in cool climates.
Dwarf English Cherry laurel 'Otto Luyken' (Prunus laurocerasus); compact plant that can be pruned to a low hedge. Grows in smi-shade and sun. Has a mass of fragrant flowers in spring.
Cunjevoi, spoon lily (Alocasia brisbanensis); Wafting rose fragrance emitted over summer from the wide leafed plant that is suited to a semi shaded position. Note: flower and fruits are poisonous.
Soapwort, Bouncing Bet, Wild Sweet William (Saponaria officinalis); herbaceous plant with flowers that give of a clove like fragrance at dawn and dusk for 5 months of the year. Roots used to make a natural lathering soap. Likes cool shady locations.