It may be struggling with the salty breezes or perhaps while in a pot the roots circled the trunk and now have grown larger and are strangling the trunk. Dig down about 6 inches aroun the trunk to see if this is the case. If you cut the roots and remove them the plant may recover in time. If the problem is the salty air there is little you can do. If it is a lack of water then you may want to put a thick mulch all around the plant and water enough to keep the soil moist. Some light fertilizing (one cup of turf food per 50 square feet) every few weeks for a few months would be helpful also.
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