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. Cyclamen. Stagger some of your summer-blooming houseplants with winter-flowering cyclamen (Cyclamen persicum). The blooms on these plants last up to eight weeks with the right care. Cyclamen flowers are fragrant and colorful, with pink, red, white, and purple varieties.