About the Grass - Dwarf White Striped Sweet Flag :
The Grass 'Dwarf White Striped Sweet Flag', Acorus gramineus Variegatus, is a mounded, non-invasive rhizone. This old garden favorite loves moist conditions. The arching sword-like foliage will light up shady corners, form attractive mass plantings, or add a bold accent.
Sweet Flag is neither a sedge or a grass but a grass-like perennial and does well planted by the side of a pond or any boggy spot. It is evergreen and will grow in light shade or sun.