Just to recap, my bog garden is unlined, kind of a free range thing. I was lucky enough to have a shoreline next to a soft water lake so I just scooped out the sand down to the permanent water table and packed in wetted peat moss. The advantage was that I do not have to ever water the thing.
But, what I would do differently would be to create a separate bog for the little guys. The pings did OK, the sundews fluorished and the VFTs, although diminuative, actually self seeded and made little babies. The first problem was the deciduous autumn leaves. A few would fall on the bog and freeze to the ground. It only takes one huge maple leaf to cover a winter bud and cut off any spring sunlight. If I was lucky enough to be up there in late winter, I could try to peel each off but I would likely pull up the tiny plant roots with it. The second problem was the grass creeping in plus the weeds and even tree seedlings. At that point, the roots are so well established that weeding pulls out a big clump of peat taking the tiny roots with it. And of course, as the sarrs grew bigger they shaded out everything else. I could not be up there often enough to give the whole thing the TLC it needed.
So, I would build a second smaller bog for the little guys. Small enough so I can easily reach any weed sprouts in the summer. I would recess it into the ground like the sarr bog but line it with edging deep enough to keep the lawn grass from creeping in. Maybe about six inches below grade. Then I would cover it with a heavy gauge screen, rigid enough to keep the leaves and snow from collapsing it in the winter, but with about a cm of mesh size to let the flowering stalks poke out in the summer. This way, whenever I do actually show up in late spring, I would merely lift off the screen and bang off any shading leaves without disturbing the wee plants, then replace it for the summer.
Maybe when I retire…