Just came across a cute webpage (this one: http://www.homemadesimple.com/en-us/garden/pages/jade-plant-basics.aspx) that suggests putting house plants into tin cans. They either recommend making small holes for drainage or putting rocks on the bottom to avoid root rot. Now, it so happens that I have a cute tin can collection AND my regular pots are all pretty boring, so this would be a really interesting solution. However, I am afraid that (1) the can will rust through and through quickly; (2) the plant will suffer from the rust. Has anyone made this work, and if so, how?