I'm currently growing Sarracenia and VFTs in 12 inch deep plastic planters. The plants seem to be doing well, but the planters have drainage holes which are difficult to plug effectively, so I have to water fairly constantly, which is a royal pain. I'm considering switching over to heavy-duty plastic bus tubs, but I'm concerned by the shallowness of the tubs. Is around 7 inches deep enough to cultivate large Sarracenia and VFTs? Maybe I should just put the planters into the tubs, and use a hybrid mini-bog/tray system? Pics to follow, when the chance presents itself. Suggestions welcome...