Hi Bob&Syd, I asked a similar question a little while ago specifically about potted Java Fern.
From what I can gather, generally speaking most plants do better removed from pots and depending on what they are can either be left floating, planted into the gravel or substrate or plants like Java Fern tied to bogwood, rocks or ornaments.
I think it depends on which specific plants you wanted as to what would more meet their needs.
There are lots of planty people on here who I'm sure will be able to give you some more advice
http://www.kokosgoldfish.invisionzone.com/...showtopic=49509