What is the longest flowering summer flower?
Geranium. Probably one of the longest flowering garden plants, hardy geraniums start flowering around may, and continue to october, depending on the variety. One of the longest flowering varieties is geranium ‘johnson’s blue’ (illustrated) which is also attractive to bees. A: indoor flowering plants that can bloom for a long time include orchids, kalanchoe, the full-sun lavender, various kinds of bromeliads, and anthurium, which can continue blooming for several months.