Let's talk about cutting back hosta plants. Hosta flowers can be cut back as they fade -- cutting back hosta flowers encourages reblooming, and can be achieved by simply clipping the long flower stalks once the flowers have faded. Hosta flowers can be clipped back throughout the growing season. Fall is the time to cut back the foliage of your hostas - many varieties display fall color, so don't cut your hostas back until they begin to fade. Hostas are hardy: there's very little chance that a frost will damage the roots or bulbs of the plants. Wait a few frosts, then you can clip the hosta leaves back to the soil.