Red Water Hibiscus (Hibiscus coccineas) is only hardy in Zones 7-11.  It has deep crimson flowers that are 5 - 8 inches wide.  It is among the reddest of hibiscus in the plant kingdom.  Not only are the flowers magnificant but the leaves are narrow and divided, much like that of a Japanese maple leaf.  A truly striking plant.

This hibiscus will grow 6 - 9 feet high and 3 - 6 feet wide.  Plant it in sun to part shade but it prefers sun.  It needs moist soil or water to 4 inches deep.  You can winter it over by bringing it indoors or covering it with heavy mulch. 

This is another bog plant that is a favorite of the hummingbirds and butterflies.