I bought a Buckthorn tree in April and planted it in a large container on my patio. It was beautiful, but now has one side that is dried up and looks dead. It is definitely thinning out, am afraid it is dying. I water very day because the moisture meter says it needs it. I don't know what to do about it and hate so much to lose it. I have given it some Osmocote but it doesn't seem to be helping. Does any one have any suggestions?