You can plant in normal clay pots. Just add a plant substrate like eco complete and put them in there.
I know a lot of people that do it this way because they have barebottom tanks but they want plants, so they can have easy of cleaning with barebottom but plants for looks and for the fish.
I don't have anything like this right now but I don't have any lights on my tanks at the moment that will support plants too well.
Plants generally have to be pruned and cut back even when your whole tank is substrated, so it doesn't make a massive difference. It will generally not be an issue to put them in pots, just make sure to research the species first as some may not be good candidates.