If the tree is one of the tallest things around, it may be advisable to a install copper protection system in the tree. A lighting protection system routes lightning strikes down into the earth without affecting the tree. Without protection, trees can be blown up in less than a second.
Another step when considering lightning is to assess and treat any previous lightning damage. Many older, large trees have signs of lightning strike. Specialized treatments can be lessen the impact of pests and speed the healing process. These treatments should be made if improving the trees likelihood of survival and safety is an objective.