Rejuvenation Pruning Shrubs - Step 1
To give your overgrown shrub new life, start by pruning off all dead wood and broken branches. Also remove any wood showing signs of pest damage or disease, such as fungus, borer holes or dripping sap.
This rejuvenation pruning allows a new form to develop in spring when new growth emerges and affords the opportunity to keep up with annual pruning.
In this case, drastic rejuvenation pruning is in order. Rejuvenation pruning is a kind way of saying cut every stem off 4 inches above the ground.
Older, overgrown lilacs may require drastic rejuvenation pruning, which means cutting off every stem four inches above the ground. Resilient lilacs will grow two to three feet the first season.
If your lilac has lots of old wood, encourage new growth with rejuvenation pruning. For vigorous new limbs, cut back one-third of the old wood to the ground each year for three years.
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Others will stand up better to being pruned in stages, over three or four years. Remove a portion of the vine's oldest stems each year, cutting them back to a foot above the ground. Rejuvenation pruning is best done is spring, ...
 See also: Stem, Grow, Spring, Foliage, Bloom
  
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