Wild Goldenglow (Rudbeckia laciniata) - Perennials that bloom yellow flowers on tall, thin stems July - October. 
 
Growth: Can grow 7 feet tall.
Light: Full sun.
Soil: Prefers moist soil.
Hardiness: Tolerant of heat, but not drought. May self-seed.
Maintenance: Needs little care. Deadhead for longer blooming period.
Benefits: Attracts butterflies.