Hay bale gardening, planting five sides?

So, I am wondering if I can hay bale garden and plant all five sides. Carrots on top, tomatoes on four sides with nasturtiums thrown in for beauty. I will be growing the tomatoes up my deck which of course will also help keep them away from the deer...
Any reason I can't do this if I fertilize well? Suggestions?

What an interesting Idea! I don't see what I wouldn't work, other than not having enough room. You may have to use two bales. I have heard you have to soak the crap out of it before you start.
Keep us posted. I would love to see how this turns out.