What are irises doing in winter? They're resting - and that rest matters. In winter, bearded irises enter dormancy, slowing growth and storing energy in the rhizome to prepare for spring bloom. Yellowing or browning foliage is normal, and some irises may die back completely while others stay green - both are part of the process. #Iris101 is our year-long series sharing simple tips, seasonal tasks, and growing wisdom inspired by 101 years of experience. Explore more advice in the Grow & Care sect