Lobelia Great Blue For late summer blue blooms these are the ones to choose. The stems are 2-3 ft. tall and clustered with deep throated flowers that humming- birds love. Grow easily and are adaptable to moist shady areas.
http://www.grimmsgardens.com/shop/ohio-spiderwort-native/ Spiderwort is a perennial, grass-like plant, that blooms all summer long. Flowers first appear in spring and then continue thru to frost. It grows 1 to 3 feet wide and tall. Spiderwort likes a wide range of soils and full to part sun.
'Pinky Winky' Hardy Hydrangea -Perennial -Sun/Partial sun -6-8' tall, 6'8' wide (need 10 feet total space) -summer blooms- open white, change to pink prune 2/3rds of the way to the ground late winter/early spring