The species name of this perennial pretty much sums up its monumental presence. Everything about this thing is BIG. Towering to 6 feet tall, leaves up to 3' foot long, and in summer, big yellow daisy flowers a good 5-6" inches across, with many narrow petals. Big, bold, and beautiful. Zone4+
Plant it as a specimen behind a pond where both foliage and flowers can be seen, or grow behind much shorter, moisture-loving plants in the center of a damp border.