Experts and BHG readers answer.
Crape Myrtle bush not growing this year
Thanks for writing. If one crepe myrtle has started growing but the other hasn't, I'd be afraid that it probably won't come back.
I wouldn't guess too much old wood would be a problem, though there are lots of reasons the tree may not have made it. But if you've had crepe myrtles in your Zone 5 yard for 8 years, I'd say you've done very, very well --- there are only a handful of crepe myrtles that do well in our cold Zone 5 winters.
---Justin, Senior Garden Editor, BHG.com