Depends how big they are. I do preventive pruning (pinching) whenever I
see a tiny new twig growing where I don't want a branch. This is minimally
stressful for the tree. Major pruning should be reserved for the dormant
season, in most cases.
If your neighbor is likely to start hacking at the tree unless you prune
it now, then prune it now.
The bottom line: don't cause the tree unnecessary physiological stress.
"Red Twig Dogwood" is a shrub/bush, it doesn't grow very large. If
it's encroaching onto your neighbor's property then you planted it too
close to the property line.... if just planted you can move it.
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