You can see the Aglaonema simplex "in action" in this video that I made recently. Watch for it at 2:15 in the riparium planter. There are various other ways you can plant that plant, too.
28-I-13-Hillstream-Riparium - YouTube
If you grow it up and give it good light + ferts the Lagenandra will bloom with this impressive purple-throated spathe.