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The container should be large enough to accommodate the tree. Therefore, the mature size of the tree should be considered in order to choose a container with adequate space to accommodate both the growing tree and its roots. Containers should also be as wide as they are high in order to provide the best possible insulation to the roots. Drainage is another important factor when choosing a container. Always check the bottoms of containers to ensure that there are ample drainage holes for excess water.

If they were very young trees, he might be right but not at the age of your trees. With adequate rainfall, the trees would start putting out deeper routes. The best thing is to try and water for longer periods of time less often. The experts say about one inch per week. Place cans at different places and when the water measures about one inch in the bottam you should be good to go.

It may be they are lacking nutrients. I would fertilize them as they are heavy feeders, especially if they are fruiting. Here is more information: https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm

Pruning the orange tree for shape is not necessary. However, you should remove any branches that are a foot or less from the ground. In addition, remove damaged or dying branches once they are noticed.

Pruning the orange tree for shape is not necessary. However, you should remove any branches that are a foot or less from the ground. In addition, remove damaged or dying branches once they are noticed. So yes, you can do this now.

Leafminer is a very common citrus insect problem, causing the leaves to distort and curl. It is easily identified - edges curled and a pale green track or whitish lines running over the surface of the leaf. When the leaf miner is your problem, cut off the affected areas. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/insects/leaf-miner-control.htm