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. Moonbeam’ tickseed. With blooms that form in early summer and last all the way until the end of fall, ‘moonbeam’ is the definition of a long blooming perennial.