I had a craving for Sinigang (a Filipino dish) and one of the ingredients I purchased to cook it was Kangkong (aka Ong Choy, Water Spinach, etc.). I just used the tips and leaves and saved the bottom stems. I then cut the bottom about .5 inch from a node so the stem can easily soak up water. I’m planning on trying to plant this if it roots.
The next day, I was really surprised to see some of the stems already rooting, just one day after I placed them in water.