polka dot plant propagation methods

From what I gather, the best way to propagate polkas is to cut and place them in dirt and keep them in a green house environment. I might have to see if Mom still has her aquarium that she's not using. If I can get a big enough tank, I'd like to start a Paludarium (mini eco-system with water and land) I don't think I'd put animals in it though, just plants.