Daphne × transatlantica Eternal Fragrance ('Blafra') - This compact semi-evergreen daphne produces flowers on new growth, which means that the flowers keep on coming throughout spring, summer and autumn. It is a cross between D. caucasica and D. sericea, and is still quite rare. Its highly scented flowers will fill the air with their heady scent, so plant it near an entrance or pathway so you can enjoy it to the full.
Sanguisorba officinallis 'Pink Tanna' Zone 4a (-30 to -35F) "Light pink catkin-like flowrs hed erect for a long period in mid-summer. Forms clumps of handsome foliage. Flower spikes to 30" tall. Easy to grow in rich soil and very tolerant of heavy clay soils. To 2' wide, deciduous in winter. . . ." (Description by www.xeraplants.com.)