Ask-a-Dave's-Gardener: Pruning heavily \"hedge trimmed\" Oleander, 1 by Tinkerbell_Leo

Tinkerbell_Leo wrote:
Sadly, my gardener enjoys the ease of using a trimmer rather than pruning. I adore oleander but only ever see blooms that escape him. These oleander are probably 30 years old, I\'ve lived here for 20 years and suddenly, about 10 years ago, the trimmer came into use. How does one prune to create a more natural look? I will do this myself and tell him not to touch them, I am asking because I don\'t want to harm them as they are older plants that have only been sheared for quite a while. And if you have an answer for this, consider pondering how to do the same for a very lovely, healthy, old camelia bush that is now a box. Thank you :)