I planted a yellow magnolia tree three years ago. It was approx. four foot tall. It has been growing well and producing nice leaves and vibrant yellow blooms. Last year I expanded my irrigation system to fully cover our property. Since doing this everything has flourished except this tree. I feel it got too much water. Its leaves turned brown earlier than normal as the weather got cooler in the fall. I have wrapped it each winter to protect it and help it mature. It is approx eight feet tall at its highest now. This spring though it hasnt grown any leaves or had any blooms. I know it is alive as a light scrape shows it is very green. It is as though it just stopped doing anything or never woke up from winter (it was mild, no snow first time I can remember). Or maybe still in shock from over-watering? Im at a loss as what to do. Any and all suggestions are appreciated to bring this back to its vibrant self. Thank you.