Q.crape myrtle
We bought a crepe myrtle potted plant in hopes to plant in fall. The leaves are turning yellow. We water daily. Do we need to get the planted sooner? Is there a good fertilizer for crepe myrtles we should be using?

A container tree may need watering twice a day if temperatures are above 80 degrees F.
Yellowing leaves can be due to watering issues; too much or too little, pests, disease or stress.
This article has information on growing a Crepe Myrtle.
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-care.htm
https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/tips-to-grow-crepe-myrtles-in-containers.htm