I grow irises in beds as well at pots. Potted irises tend to bloom earlier than they normally would as the soil warms the roots before the ground temps warm. However, a lot of irises bloom not due to warmth but due to the length of daylight. That being said, I have some of the same variety planted on both the north side of the house and south slope in the garden and the southern ones always bloom before the ones on the north side. I can actually slow the blooms of the potted plants by putting the pot on the north side of the property. So I would have to say in my opinion.... yes.
