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How to build a six-sided planter box?

I am trying to build a six-sided planter box around a tree. I am having a problem joining the pieces together, I am using landscaping timbers to build this box. My problem is getting the ends to join and have stability to the box. Please help.

Figure out how large you want this planter, because you'll be using the radius of the "circle" that your planter will make as the length of each side. So say you want a 3' radius planter, 3' will be the length of each side. Make a 60 degree cut on the end of each board so that it looks like this /___________\, where the bottom is 3'(or whatever length) and the angle between the cut and the bottom is 60 degrees. Hope that helps.
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