Vietnamese coriander is also called rau rum, Vietnamese cilantro or Vietnamese mint. Like many members of the Polygonum genus, it is easy to grow and under the right conditions may become invasive. To prevent this from happening at the nursery we keep it in a dry location, where it only receives water once a week. Grow in afternoon shade in hotter locations. The flavor is very similar to cilantro, with a hint of lemon, and without the soapiness that is often associated with cilantro. It makes a great cilantro substitute during the summer, when other cilantro species suffer and die under hot dry conditions. If you are concerned about the plant spreading, grow in a large pot.