I would think the black plastic pot, if it is included as the form by which the bottom of the soon-to-be-drape pot is formed, would not be sticking to whatever you drape it on given that the drape doesn't touch other spots to stick to. But I have not done this but would think the hidden black pot that could be included would be more beneficial than not... else, I wonder why the black pot would be pictured?... Shrug!
