I live in Louisiana (area 8b). My sunny area in my yard sometime floods for a few weeks (I live on a lake). This happens about every three years and sometimes lasts three weeks. My first bed is 4x13 and is two concrete blocks high. The first 8" is filled with masonary sand and then on top of that, I've got Mel's mix in the second stack. I figure if the sand is in standing water, my plants will still be okay but I'll have to wear rubber boots to get to the garden. After reading Mel's (new) book, I was thinking about staying with 4'x4' squares and having them raised off the groumd on skids. I am thinking about using either 4'x4'x3/4" plywood on top of 2x4 skids or in stead, maybe using a sheet of 4'x8' Hardi Board cut to 4'x4' on 2x4 skids. This way I'm above the water or I can move the whole planter to another area out of the water. I can also move a bed or beds to a shadier spot in summer if it too hot. (PS, I know about having drain holes.) Is anyone doing this and also, is there a problem in winter, since the cold air can also get underneath the bed?