Q.Pruning crepe myrtle
Live in Central Florida – get occasional freeze in Jan or Feb. When should I prune my tree back? Some here say Jan – I thought it was always Feb or March.
February is a good time to prune the tree in it's dormancy.
Don't be to quick to prune your tree, often a Crepe Myrtle does beautifully without pruning.
Here are some links that will give you more information and help you.
https://edis.ifas.ufl.edu/ep399
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/pruning-crepe-myrtle-trees.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/best-crepe-myrtle-pruning-time-when-to-prune-crepe-myrtle.htm