Nerium - Oleander.
Jul 03, When to Prune Evergreen Shrubs. In general, prune needle-bearing evergreen shrubs in early spring, toward the end of dormancy and before the emergence of new growth. Pruning the evergreens at this time allows plenty of time for new growth to emerge, as well as plenty of time for these new shoots to harden off before the following winter. Almost without exception, evergreen shrubs tend to have flowers on the tips of branches that were produced in the previous year.
In this case, simply prune off the dead flowers by cutting back to the first par of healthy buds below the faded flower truss. Apr 02, Summer blooming shrubs such as summerweet (Clethra alnifolia) and blue mist spirea (Caryopteris x clandonensis) are pruned in late winter/early spring because their flower buds form on new wood produced during the current season.
Spring flowering shrubs (those that bloom before mid-June) should be pruned after stumppruning.barted Reading Time: 3 mins.