I planted some of these cleome (Cleome Señorita Rosalita) last year and was really happy with them - they bloomed from June until first frost. They spread more than other cleome I've had, and also held up better without staking.
Spilled Wine® Weigela Wine & Roses® weigela has been a garden classic since we introduced it over 10 years ago. Have you tried its little sister, Spilled Wine®? Both have that luscious dark purple foliage that contrasts so beautifully with the pink flower
Dalmation Bellflower produces beautiful mounds of purple bell-shaped flowers from late spring through summer. Low-growing plant is perfect for adding color in front of other perennials. Grows only tall. Spreads Prefers full sun to partial shade.