The roots do not grow that deep or widespread, but irises are prolific reproducers. They will grow new rhizomes connected to the first, requiring they be dug up, separated, and replanted every 3 to 5 years. They may become a problem in the future if you plant them too close to the tile bed.
Hi Lisa,
The roots do not grow that deep or widespread, but irises are prolific reproducers. They will grow new rhizomes connected to the first, requiring they be dug up, separated, and replanted every 3 to 5 years. They may become a problem in the future if you plant them too close to the tile bed.