Right on. I love the look of them, but they are a lot of work and it would suck to build it and find out there was some "rule" about not using them. We're really lucky here for free, abundant resources. There is a bay about twenty minutes away that fills up with driftwood logs all year long, so we will be collecting some of that to work with as well.
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Rocks actually work well, cause they heat up in the day and when you get cool nights the rocks will keep the soil warmer longer into the night. They do suck to build however as far as the lifting goes haha built about a dozen last year alone for customers as i do landscaping / yardscaping as a career in summer.
That's a great point. I guess using darker rocks on the outside would be even better for heat retention. Thanks for the info.