<p>With its commanding 6-foot height and deep purple foliage, <em>Pennisetum</em> purpureum 'Prince' can be used as a regal backdrop in a border, or a specimen plant marking a gate or a doorway. This dramatic grass has several common names, including elephant grass, Napier grass, and fountain grass. It's native to Africa, where the long hot summers give it time to flower and go to seed. That doesn't happen here, or any place where the temperature drops below 32 degrees. That's lucky for us, because it can become invasive. All it needs is sun, average water, and good drainage to develop its best color and thrive.