Posted: 19/10/2015 at 18:53
maggie, is this the yellow leaved dogwood?
cut back evenly every year to a few centimetres from the base. Cut out all weak growth. There is no reason for your plant to lean unless its growing lushly and there is a strong prevailing wind.
So, cut back hard in spring. As growth develops use a couple of short bamboo canes to maintain upright habit. Often over wet or rich soil conditions make for rapid lush spring growth that is vulnerable to strong winds so this is when you need to support.