This native shrub is found throughout the area, typically found in open areas with moist soils. Read more about Common Elderberry from a sample page from one of my wildflowers guides.
Only the blue or purple berries of elderberry are edible. Edible berries and the flower are used for medicine, dyes for basketry, arrow shafts, flute, whistles, clapper sticks, and folk medicine. Fruits of elderberry are gathered from the wild for wine, jellies, candy, pies, and sauces. (Source: http://plants.usda.gov/plantguide/pdf/cs_sanic4.pdf)
Read how to pick and cook elderberries.
Read how to can elderberry juice and to freeze elderberries.