I just noticed this crack at the base of a Mexican White oak tree in my yard. The tree was planted last November and has been growing very well. It has put on 2-3 feet of growth since being planted and is up to about 12 feet tall. There is no yellowing of leaves. It all looks healthy except for this crack.
For some background, I live in San Antonio. We did have a bad freeze in February of this year with temperatures around 10 degrees. We have had a more wet summer than normal. Otherwise the tree has been fertilized regularly, and I cannot think of any other issues.
Any ideas as to the cause? If there anything that I need to do at this point? Is the tree in serious trouble?