Bearded iris plants require a lot of sun and a mediocre amount of water. They thrive in neutral pH soil and is quite sensitive to insects/pests. The biggest improvement that can be made in the plant nursery to further their growth is to have the sufficient amount of watering but most importantly, adjust the greenhouse so that there is more sunlight entering the enclosure/ there is more lighting in general (long day setting).
All of these industries would be the correct answer
