Teresa, according to Brent Heath (of Brent and Beckys Bulbs) with daffodils once a third of the foliage (for daffodils) turns yellow you can go ahead and cut them back, you don't have to wait until it is brown. But as Doug points out that's why it is a good idea to pair daffodils with daylilies or if they are in deciduous shade you could combine them with hellebores which also helps to mask the unsightly foliage of daffodils when they die back after blooming. I cut back unsightly iris ...»