Anemone, Japanese, Pink Saucer, 36-40", zone 4, spreading clumps of dark green foliage, showy 2.5" silver-pink flowers. Blooms August to October. Part shade.
Butterfly Weed, Asclepias Tuberosa, zone 3, 24-30", June-August, prefers full sun-part shade and well drained to dry soils, butterfly magnet!
Shasta Daisy, Crazy Daisy, 24-30", zone 4, attracts butterflies. long blooming, late spring to late summer. Full sun - part shade.
Daisy, Pyrethrum, (painted daisy) Robinson's Mixed, zone 3, 26", red, pink, white, June-August, full sun-part shade
Foxglove, Large Yellow, Perennial, 24-36", zone 4, hummingbirds love these. Blooms early spring - summer. Part sun - part shade.
Strawberry Foxglove, Perennial, 24-36", zone 4, hummingbirds love these. Blooms early spring into summer. Part sun - part shade.
Balloon Flower, Fuji Blue, 24-36", zone 3, Long blooming. Blooms June - August. Part shade - light shade. (I've had great success in full sun also.)
Gaillardia,Single Mixed, 24-36", zone 2, Butterflies love these. Some of the best colors available. Blooms continuously from summer through fall. Full sun.
Heliopsis, Burning Hearts, 36-48", zone 3, Excellent late season flowers, August - October. Full sun.
Hollyhock, Nigra, zone 3, 60-72", dark maroon almost black blossoms, July-September, full sun-light sun
Oriental Poppy, Haremstraum, 36", zone 3, Dazzling mix of colors. Blooms late spring and early summer. Full sun.