yes, you can cut off the leaves, but, not all of the way off. cut the leaves down about 1/2 to 3/4 of the way to the rhizome. also, they need to be outside for the winter or they won't bloom for you next year. so, if at all possible get them back in the ground or at least leave them outside for the winter, not in the basement. I did the same thing with my iris, & now I need to get them back in the ground. easier said than done since I have about 5 wheelbarrows full to re~plant. but, I will get it done. good luck with your re~planting chore. I wouldn't put it off till next spring, though. get it done now, if you can.