Flowers of Southern Comfort Heuchera
Cutting the daylilies back after blooming will give you a fresh green groundcover for the remainder of the summer into fall, no brown leaves.
Sedum Autumn Joy will flop with too much moisture. You can cut it back in the spring but the flower heads will be small. It is too heavy to tie up now, but it can be put in a circular open cage in the spring. I don't like using too many supports, but I will definitely do this for an upright sedum. Sedum Autumn Fire is similar to Autumn Joy, stays upright but the flower heads are not as impressive.
Amaranthus Love Lies Bleeding can be pruned so that it forms many pendulous flowers. Mine has never looked like it should because I planted it too close to the miscanthus.
I cut the Unique Hydrangeas down to about two feet high in the spring and they still grow to about seven feet tall.
The Unique Hydrangea flowers are beginning to turn to that rosy pink that I love, so I will be cutting them this weekend. You can leave them on the shrub, however, they do not hold up as well as Limelight over the winter months.