1. Find a node: the small bump where a leaf meets the stem. That's where new roots grow.
  2. Cut a piece 4 to 6 inches long, just below a node.
  3. Remove the lowest leaf so the node can sit underwater.
  4. Place it in a glass of water in bright, indirect light.
  5. Change the water every week.

Roots usually appear within a few weeks. Once they're a couple of inches long, the cutting is ready for soil, or for a friend who needs a plant. Philodendrons and tradescantia root just as easily.