I would like to know how to prune and care for this lovely shrub. I had a wasps nest in it during the Summer to stayed well away! It's quite thick and bushy and runs along the railing around the pool. It is now creeping towards the pool and shedding its flowers into the pool. The main trunk is now about 4" in diameter. So the name of this shrub would be helpful, please, and advice on how to prune and train it.