Sweet Flag (Acorus americanus)
Sweet Flag forms stands of sword-shaped, stemless leaves that fan out directly from the roots. A colony of them may look like cattails or iris leaves from a distance. Green-yellow flowers protrude and arc from stiff spathes in mid-summer, giving way to fleshy berries which turn a rich brown as they dry in the summer heat. The "sweet" in the name comes from the aroma the leaves give off when broken.
Sun Exposure - Full
Soil Moisture - Wet, Medium-Wet
Height - 2 feet
Bloom Time - May, June, July
Bloom Color - Green
Photo courtesy of Prairie Moon.