This species is a White Louisiana Iris with yellow signals.
The best time to plant Louisiana irises is from October until March
Louisiana irises should be grown with as much direct sun as possible. Although they will tolerate shade for part of the day, at least about six hours of direct sun is needed for good blooming.
When preparing a spot to plant Louisiana irises, incorporate a generous 3-inch layer of compost, rotted manure or peat moss and a general purpose fertilizer following label directions. The plants prefer a soil high in fertility and organic matter. They also generally prefer an acid soil.