Q.Can bird of paradise cuttings be saved if bottom of stems have root rot?
Plants were dug up and left in buckets for friend to plant. Friend over watered.

Certified GKH Gardening Expert
During research, I only found information for propagating bird of paradise through division of rhizomes. As a last ditch effort, you could try cutting off the rotted material well above the damaged area and then dipping the cut end in rooting hormone and placing it in well-draining potting soil.
https://www.gardeningknowhow.com/ornamental/flowers/bop/propagating-birds-of-paradise.htm