That sure is a nice looking tree. I've learned that tropical plants need to be pampered in non-tropical climates so that they don't die. I have a little tree that needs pampering in way that is closer to arctic than tropical. It likes cold and wet. Sometimes the weather is too warm and dry for this plant. It does fine in the winter. But during this drought and extra warm weather that we are having, I have to pamper it on the porch where it us shaded and I water it every day. I am very busy so it us a hassle having to pamper it. But if you really love a particukar plant, it doesn't seem so bothersome. I tend to avoid tropical plants altogether because they require higher maintenance in my location, but I do find them to be very beautiful and alluring. So I understand what you are going through.
I found some good info for you that should help. Here it is:
"Now this is important! When you plan on growing your tree in a container be certain to cut the main tap root. The tap root runs deep into the soil in search of water. Before you plant that tree cut that tap root. By cutting the root you stimulate vigorous lateral but shallow root growth. This root growth is better suited for container growing. Moringa trees planted without a pruned tap root perform poorly in containers."
That is a direct quote taken from the following site, which has even more info on the subject:
This site also has some good info:
https://www.moringamatters.com/how-to-gr ... -tree.html
There seems to be lots of good information about this tree online. It seems to be a popular little tree. Now you've even got me interested in this tree.
Wishing you a wonderful gardening experience.