When do you prune and fertilize an orange tree?
Orange Tree in Texas
Certified GKH Gardening Expert
Pruning of the orange tree should be done, either, after the fall fruit crop, or anytime during early flowering.
Fertilization is usually done only once a year. How you fertilize will depend on how you are planning to use the oranges.
This article will explain in more detail: https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm