Q: I was given a peace lily in 2009. I replanted it into a larger pot but it is now very large. How do I trim it back?
A: I think your best bet is to simply divide the big plant into two. Spread newspapers on the floor and carefully slide the plant out of the pot. You should be able to see individual thick roots that have several leaves attached to them. Use a sharp knife or heavy shears to cut apart the roots while keeping the leaves attached. Plant them in separate pots with fresh potting soil and fertilize lightly with liquid fertilizer.