I have a large tree in my front yard and last fall I noticed a crack down the middle. Six months later, it appears the crack is getting larger (see pictures below). Is there any way to save the tree, or does it need to be removed?
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Consult a tree surgeon. If you want to save it, it might be possible to cable the top parts (not "tie a rope around") to keep it from spreading wider. Depending on the decay of the trunk, this might or might not make any sense to do.
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Yes, a professional arborist could save the tree using cabling and bolts as the practical Ecnerwal illustrates. This would be something you would do as soon as possible. It appears that the two halves are held together by little more than bark. This tree would now be classed as a physical hazard to you and anything close to it.
If you did choose cabling and bolts the problem does not go away as the tree will continue to grow and put on weight. Trimming on a regular basis would be recommended. The usual finding on close inspection is decay and rot have set in where the tree splits. If this is the case then cabling is not appropriate as it could still be a hazard.
With the cost of an arborist the best solution is to get the job done once. Have it removed and the stump chipped out and plant a new one. Your tree had issues due to included bark. These tree care sites note that included bark is a key reason for quick action, usually removal.