Usually the reason bearded iris do not bloom is: 1. Not enough sun, they need 6 hours of full sun a day) 2. Overcrowding, they haven't been divided in several years and have grown rhizomes all over each other 3. Being planted to deep in the soil. The top of the rhizome should be exposed to air and they need plenty of air circulation. They do not like other plants crowding them or covering the rhizomes, it is not a good idea to have any pretty ground covers growing over them. Do not mulch them. It doesn't sound like it could be the first 2 reasons but these three are the only ones I can think of now. Maybe Chad (another iris grower) can think of more and will respond. Carolyn in Los Gatos