Fall is the best time to plant for spring flowers............if you plant now you might get some leaves but no flowers. Follow the planting depth............don't plant too deep or they won't flower.............use bone meal wearing gloves and face mask, different Iris have different PH.........regular iris 6.0 to 8.0, Japanese 5.0 to 6.0, Cubeseed 4.0 to 5.0, oregon 5.5 to 6.0,southern blue flag 5.0 to 6.0, vernal 4.0 to 5.0. I don't have all of them but you should test you soil as you also might need to add lime. I would opt to plant them as they could dry out and you could lose them.