Answer: Unfortunately, with some evergreen shrubs, if you prune back to old wood, no new growth will appear because there are no latent buds on the old wood. If there is any new growth at all on your shrubs, it means the roots are alive and over the years the plants may grow enough to cover over the pruning cuts. If there is no new growth at all, the renovation cuts were too dramatic and your shrubs did not survive the pruning session. For future reference, it's best to prune less than one-third of the live growth when pruning hedges. This will always provide some old wood, on which new growth can develop.
Best wishes with your landscape!
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