Same here, Rita. There is a good online video on it but I just tried finding it and couldn't. I did find some negative videos on pruning them, which implied pruning them at all was wrong. They are exceptionally easy to start from cuttings.
When I did see it I did some fullscreen captures. The point of it is, they get cut to the ground. I've done it and they're now in beautiful bloom...and low. A neighbor never trims hers and they must be 10 - 12' high.
