I have planted a tree by seed and after 1.5 years of growing, I put it in the ground. It has been in the ground for about 5 weeks and all the leafs died, the branches near the top are drooping down. and winter is coming soon. Another key item of advice was that the leafs were not brittle when they were brown and died, I do believe that because it rained hard for multiple days in a row, the tree drowned. Is it possible to bring the tree back to life??