Answer: Although these trees appreciate regular watering, it sounds as though you may be keeping the soil to wet. Another concern is that plants in containers have their roots almost exposed to the elements. Being in a full sun location makes the trees happy, but their roots can literally cook if sunshine directly hits the pots. From your description, it sounds as though the trees are really stressed. I'd water thoroughly and then allow the top 2" of soil to dry out before thoroughly watering again. Try shielding the containers from sunshine - perhaps setting some decorative pots in from of them would help. I hope so!
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