I have learned a lesson not to let your Iris plants go undivided to long. I had three clumps that had to be moved because I had planted them in the corner of the patio, big mistake. They were starting to get very crowded. I dug up all three clumps and proceeded to try to split them. After trying many different methods..I finally found one that worked. I will be using this method again..for those hard to divide plants. I used a axe and hammer to slip them into smaller clumps and then used my hands to divide the bulbs. I will be re-planting these beauties into a area of my garden where they will have plenty of room for them to grow.