I planted two katsura maples a couple of years ago in different locations in my front yard. The one in partial shade with lots of compost in the soil is very healthy. The other one is in a more exposed site. I improved the soil when I planted it, but the surrounding soil is very hard. Last year the bark split on the trunk (possibly due to lots of rain followed by cold temperatures) and this year the foliage is very pale, ghostly in comparison to the other tree. Some of the leaves went from green to pale yellow and have curled in a bit. It does not look happy. Is this likely a result of the split in the bark, the quality of the soil, or the exposure to sun and wind?