If you need to prune your Camellias, you can prune them when this year's flowers have faded. Which is round about now. That will give your plant enough time to adjust and put on new growth.
Pruning back and how will be totally how you want your shrub to grow. Think about the shape and the size and remember, there should be regrowth from that point, so you may need to cut lower down to allow for that. The general rule is to cut before a join/split like many shrubs or above any swollen areas. If you are pruning into more older and thicker wood, try to aim the cut downwards to avoid water sitting on them.
Posts
Pruning back and how will be totally how you want your shrub to grow. Think about the shape and the size and remember, there should be regrowth from that point, so you may need to cut lower down to allow for that. The general rule is to cut before a join/split like many shrubs or above any swollen areas. If you are pruning into more older and thicker wood, try to aim the cut downwards to avoid water sitting on them.
I live in west central Scotland - not where that photo is...