At less than 2 feet it will not take more than 3 weeks for it to establish quickly. They grow from 3 to 5 feet per year so hopefully next year it will be at the top level fence height .

Top 8 crape myrtle cultivars.

Close to seven months have been since I planted the myrtle.(above)

Below is the tree at the same level as the fence. Probably gained three feet in height already.