Posted: 18/07/2013 at 10:19
If the dogwood has well-coloured stems in the winter, cut back in spring, otherwise you lose the whole point of growing them! Cut the old stems to the ground.
Forcythia: cut out one third of the oldest branches every year after flowering.
Camellia don't usually need much pruning if they are in the right place.
This in answer to the original post, now 8 months old.