I came across this blog and although I'm not in to this type of gardening, this topic I was interested in. I thought about make one of these planters for years but never got around to it.
So if anyone is interested in making a trough planter go check it out. It has detailed instructions on how to make a trough planter out of hypertufa mix.
The link below is at:
Gardening on a slope in Southeast Tennessee
This blog has also won a few nominations and awards.
Best Photography Blog
Best Eclectic Garden Blog
Best US Blog
Best Tennessee Blog
Garden Blog Of The Year
Blotanist Of The Year