I needed to reduce the size of some of my overly large houseplants. So, after drastic root pruning, and pruning back many of the stems, I repotted some of my pothos and philodendrons. Now, only a few months after I have done this, the plants are going nuts, with their roots through the bottom of the new, larger pots, and tons of new top growth. I don't have room for this jungle---is there any way to limit the size of these things?