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Bumping up the list.
I think your thread title is misleading Richard. I see you've had lots of views but no help. I haven't a clue about oleanders so can't help there. This is not reversion. Reversion is when a fancy cultivated plant reverts (ie goes back) to its original form.
Try a title like 'Buds and leaves shrivelling on oleander' you may get more help
Bella - like Richard it would be best to start a new thread for your query as people won't look here if the thread title is not of interest and will not see your question.
That said, it depends on the type of clematis you have. Some need no pruning while the bulk of them are done in late winter or spring. Do you know what varieties you have? Same applies with shrubs - many are pruned after flowering and others need pruning in late winter and so on.