Attached Link: 3Ddoodling

In the image at the link, I've created a couple of picture frames using C3's spline modeller... each is one object. The problem I have with the way I have them textured is that the grain of the wood is correct on the horizontal "pieces" of the the frames; but is, naturally, 90 degrees off on the vertical "pieces". What would be the best/easiest way fix this? Shader domains? or UV mapping.... and can you use UV mapping with C's procedural shaders? Have tried interpretting the manual, and I feel like I'm getting close to understanding how to do this... then I get a headache and things get kinda blurry. Will continue trying to figure it out, but I was hoping that maybe someone could put it in simple English for me. Thanks in advance.