I've been toying with the notion to put in a bog garden a few feet in from the streamlet that devoured my Cobra Lily last year. There are several places along its edge that are naturally swampy and I found one close by that has a raised perimeter and shaped like a sinkhole. I've got plenty of Canadian peat. Should I mix other media in? Should I line it with plastic sheeting or a kiddie pool? Wahddya think?