Q.lantana with bare branches
My Lantanta is blooming well but has bare branches without leaves or blooms on one side of the plant (tree). The plant is 6 years old or older and has been in the same pot all this time,and it is a tree 4 ft tall. I am fertilizing twice a week, perhaps it is too much. It is in a greenhouse in the winter. Please let me know if I should cut back the dead branches, re-pot it or what. Thanks.
With the age and size of your plant it sound like it could use some trimming or pruning.
Here is an article that will help you determine the best time to do so.
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-pruning.htm
https://www.gardeningknowhow.com/ornamental/flowers/lantana/lantana-plants.htm