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The main exception to that statement, is where the evergreen flowering shrub is also being grown for it's berries of fruits - ie Cotoneaster and Pyracantha. Deadheading or pruning these would inevitably mean a loss of fruiting trusses that come after the flowers.
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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. In some instances - Rhododendrons, Azaleas - you can simply twist off the old flower trusses, for there will be a new set of buds immediately below the old flower stalk.
Where the flowers are in sprays - such as with the Abelia above, then cut back to a good pair of buds - or single bud where they are not in pairs.
Shrubs such as the evergreen Berberis - Berberis darwinii etc, will have flowers along the branches at the end. Cut these back to where the faded flowers started.
All evergreen flowering shrubs - regardless of flowering time, should be pruned as soon as the flowers have finished. This will give the plant plenty of time during the following growth season, to provide new flowering growths ready for the following year.
Some flowering evergreens are grown mainly for their berry or fruit production - Pyracantha; Skimmia - some types; Cotoneaster; Fatsia; Gaultheria; Ilex - Hollies: these types should NOT be pruned after flowering, otherwise the berries will not appear. These will generally send out new shoots - for flowering the following year, after flowering and before the berries start to set.
Trim back any shoots that spoil the symmetry of the plant in mid-spring; otherwise simply dead-head the old flowers on a regular basis throughout the flowering period.