As it comes from a narrow valley in Atlantic forest Neomarica mauroi needs high air humidity to grow properly. Usually I keep them in an acrylic glass box. All attempts outside with plants in soil failed.
Then I tried hydroculture, planted in expanded clay pellets and fed with Ion exchange resin beads (Lewatit HD 50) and a somewhat wider cachepot so that humidification coulld take place. And it worked! The plant seems to be surrounded by a microclimate that is enough for her, growing and flowering.