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in Problem solving
As far as I know, you cut out the flowered stems and let the new ones replace them. They don't normally lean unless they're going to the light, so I would be inclined to support them straight. I don't think there's any issue with doing them now.
I have a large stand of this plant, along the side of a path. It does have a tendency to spread, slowly, and to flop over the path. I actually took a hedge trimmer to mine, just a couple of days ago. I trimmed it just as though it was a hedge. But if you have a specimen plant, you obviously wouldn't want to do that. These plants are pretty resilient. Quite easy to lift and divide if you fancy some more. Despite its drawbacks, it does make a good evergreen screen.