Well I abandoned my first bog built several years ago. The plants seemed just languish and not thrive like my plants i have in pots. I built it to close to the fence, so come early afternoon the western sun would be blocked. It was also to low on the one side to the surrounding ground level, so when we would get heavy rains, dirt would get it from the surrounding bed. The fig tree on that same side is also sending runner roots through the whole bog as well... so it's at least happy! I have only lost a few small plants over winter from rodents digging them up. I will just be utilizing it for a perennial bog bed... which should be fun.
The new one just uses the standard retaining wall blocks from the big box store with a liner. It sinks into the ground a bit to total about 12-15 inches in total deep. Besides the usual covering with a pvc net structure and heaps of straw, to help insulate it a bit for winter, I plan on spraying in some of that expanding foam behind the blocks. There are some decent sized pockets in there now. I ran out of pine straw to also use as a bedding cover.. so i will cover the rest of the bog and pots later with it. Keeps the splash back down.
When i was filling it with peat/water/pine needles/pearlite... my 4 year old was sitting on the edge and throwing in pine needles as i mixed it. He proceeds to fall in and get half covering in wet peat mess. Was the end of a good day for him. At least he will be the only kid in the local area that can say he has fallen into a bog.
The best thing so far is that it is some much nicer to have the plants raised up a bit from the ground! Saves on the back!
I transferred all my sleeping plants over a few weeks back and they are all sending up new flowers and pitchers. The venus fly traps in the bog are from my seeded collection last winter.
And the last white pot is of my recently collected "fancy" vft collection and a leah wilkerson... which will go to the garage in the winter.
And of course I have the standard bog building "ahh crud... I should have made it larger" reaction.