You are correct; the foliage of tulips and daffs should be left to yellow. Since you did cut down the foliage, it is not likely that the plants will return to optimal display/condition. You may see some limp growth next year.
If you find the foliage unsightly, fill the space with other same time or later-blooming plants as visual distractions. Bleeding hearts is a good one; they bloom with tulips but last longer. Meantime, day lily foliage starts up with great thickness.
You are correct; the foliage of tulips and daffs should be left to yellow. Since you did cut down the foliage, it is not likely that the plants will return to optimal display/condition. You may see some limp growth next year.
If you find the foliage unsightly, fill the space with other same time or later-blooming plants as visual distractions. Bleeding hearts is a good one; they bloom with tulips but last longer. Meantime, day lily foliage starts up with great thickness.