How often do you re-pot your indoor plants? Every year? When they look dingy? When the soil loses it's benefits? I have a few indoor plants that I'm considering repotting, simply because it's been in it's soil for quite some time. I'm curious to see how often each of you feed your plan new soil? Seems like if they're doing well and the soil is still in good shape, the soil should be sufficient. What do you think?