Anise hyssop - fall blooming/full sun/drought-tolerant
Russian sage, Perovskia atriplicifolia, 3-5 feet tall, lavender or blue flowers and silvery foliage, aromatic leaves are oblong, deeply cut along the edges. Foot-long panicles of flowers bloom for many weeks. Excellent drainage and full sun are ideal, very light shade is tolerated. Plant close to avoid staking since the tall plants tend to flop. Good for back of flower bed. Zones 4-9.
Don't Forget About Hummingbirds
Beautyberry 4' tall for the birds
Pink Cotton Candy Betony Stachys officinalis 'Pink Cotton Candy' This selection blooms copiously for 8 weeks from late June to late August in northern Illinois (USDA Zone 5). Plants form robust, dense mounds of deep green, wrinkled foliage with upright stems arising above the foliage. This low-maintenance perennial prefers moist, well-drained soil in full sun.