@DocHarvey, though you have told us you are in Oklahoma, please take a moment to go to your "Profile", and update your public profile by listing your city/state. That way, every time you post, your location will be shown in the upper right-hand corner.
Do you have any fairly large trees on the property? Scheflera do best with bright, indirect light and lots of humidity. Unfortunately, it appears that your plant is getting neither. Early morning or VERY late afternoon sun works wonders for these tropical plants. If you can put that plant under a tree(s), where it gets nice shading from the leaf-canopy, it ought to flourish. That's the way I grow mine. The hotter it is, the more transpiration is taking place, and thus, though it may seem that there is not much humidity outside, under a stand of tress, the humidity is jacked up. When we are in the mid to upper 90's, I can stand under my oaks, and literally feel the moisture produced by that transpiration. It will be 10-20 degrees cooler under those trees.
