Jonna
It's just the name of the plant: pow wow wild berry is an echinacea with a deep fuchsia/purple color. The color of the petals is bright and surprising, when something has "pow" it has energy, and "wow" is just wow. Or maybe pow wow cones from a native American (Indian) word for a gathering of people. either way, no berries, just petals with the color of berries.