Arils have different growing requirements depending on if they are full aril or half or quarter arilbred. It is too humid in the south for the full arilbreds, and even the half and quarter need the drier areas of the garden to stay happy. I think it is nice when they are labelled as aril because the casual iris buyer may not know that those iris won't grow for them and be very disappointed with the poor growth.
That said, Greg is correct - they have great prices.
