If you cannot prune the nandina during winter, you can prune it during early spring before the white flowers develop. If you cut those off, you won’t get the berries![2] X Research source
Intermix cuts to give the bushes a fuller look. If you are working on an older plant, prune one-third of the old growth.
Place the cut stems into vases filled with cool water. They should last several days.
If you can’t get a 10-30-10 granular fertilizer, a rhododendron or evergreen fertilizer will do just fine.
How much water you use depends on how dry your soil is and how fast it absorbs water.
