The difference is in the pruning. You have to prune the crepe myrtle to have a single main stem to become a tree. If it has several main stems, it becomes a bush.
yellow bush
Either it's not getting enough water, or it doesn't have enough acid fertilizer. Lack of water of fertilizer will cause yellowing leaves.
In Greek mythology, the myrtle symbolizes love, beauty, and desire. It is associated with Aphrodite, the goddess of love, because she was often depicted with myrtle in her temples and in artwork as a sign of her connection to these qualities.
A Burning Bush could be turning red early because of the temperatures in your area. If temperatures have been warmer than usual, that could be the reason.
Crape myrtles are a type of bush or shrub. They are not known to be poisonous to caterpillars or other animals.
Overwatering, pathogens, pests, soil chemistry and sun can account for japonica leaves turning yellow. Japanese quince (Chaenomeles japonica) and glossy-leaved paper plant (Fatsia japonica) have yellow leaves when the soil pH (power of hydrogen) impedes intakes of present macro- and micro-nutrients. They also show chlorotic shoots from fungal or viral diseases, heavy droughts or floods, improper light and shade and incorrect irrigation schedules.
Apple, lettuce, myrtle-tree, myrrh-bush, rose and anemone were sacred plants of Aphrodite.
Forsythia!
boxwood shurb
Its where the sick people with Yellow Fever went
If it is a bush it could be a gooseberry.