grape hyacinth & nadinia
The best time to transplant grape hyacinth is in the late summer and in the autumn when you are moving or planting other spring-blooming bulbs. Mark the locations of the bulbs you want to transplant while they are blooming so that you can find them later. Leave the foliage intact until it dies back.
Nandina in unsheltered areas took some heavy hits from the sustained cold weather this past winter. However, it is not yet time to give up on them. Test a few twigs to see if they are supple and green inside. This will tell you that the plant has probably survived and will recover. Dead wood will be apparent by June at which time you can prune it out or remove the entire plant if it is too far gone.