For Reference and Additional Information - The yellow iris that Bob describes above is not a true Louisiana Iris. The yellow iris he describes is Iris pseudacorus which belongs in the Series(subgroup) Laevigatae and not the Series Hexagonae which contains the Louisiana iris. The yellow Iris pseudoacorus (often called yellow flag) is often mistaken for a Louisiana iris. It is not native and has been imported from Europe. In true form it only exists in cream to yellow flowers, but there are cultivars. It is vigorous compared to the true Louisians iris variteties and foliage will stay green in Louisiana all winter but foliage is decidious in more severe climates. I.pseudacorus will crowd out other Louisiana varieties.
Most true Louisiana iris varieties rarely grow in water deeper than 4"-6" and as a rule they prefer just damp to wet soil.
