Does this Chinese Fan Palm look over or under watered?
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Well it is tempting to say that the growing tip looks healthy so the dying of the lower leaves might just be natural die off as the plant steals what nutrients needed and not supplied by the root ball. But there is too much die off for that simple explanation. In addition the amount of healthy green top growth compared to the size of the pot is unbalanced - the top should be more voluminous if that amount of root ball is doing its job. So how can we get more info ... if possible you could pull the root ball from the pot and inspect. Maybe by tipping the pot on one side and pulling the crown out part way. We would expect to see healthy (light coloured, not dark) roots from top to bottom of the root area. In particular where fibrous and chunky root medium/soil is used verify that the inside of the drainage holes is not blocked by stones or thick chunks of bark. While the root is exposed see if your nose can detect any distinctly distasteful odours.
Depending on what you find you might want to reduce watering since the amount of green actually transpiring is declining. If root rot is detected then you might be into a major operation on the roots.