To propagate cilantro, the most reliable method is to grow it from seed; however, you can also try propagating cilantro by taking stem cuttings from a healthy plant, removing the lower leaves, placing the cut end in water, and then transplanting it into soil once roots develop; this method is less reliable than growing from seed, but can be attempted if you want to clone a specific cilantro variety. 

Key steps for propagating cilantro from cuttings:

  • Take a cutting: Cut a healthy stem about 3-5 inches long, just below a node where leaves grow. 
  • Remove lower leaves: Strip off the leaves from the bottom half of the stem. 
  • Place in water: Put the cut end of the stem in a glass of fresh water and position it in bright, indirect light. 
  • Change water regularly: Replace the water every few days to prevent bacteria growth. 
  • Wait for roots: After a couple of weeks, roots should start to form at the base of the cutting. 
  • Plant in soil: Once roots are about an inch long, transplant the cutting into a pot with well-draining potting mix. 

Important points to remember:

  • Best method is seed: Growing cilantro from seed is generally considered the easiest and most successful way to propagate it. 
  • Choose healthy plants: If propagating from cuttings, select a healthy, vigorous cilantro plant to take cuttings from. 
  • Light conditions: Place your cuttings in a location with bright, indirect light. 
  • Root development time: It may take a couple of weeks for roots to develop on stem cuttings.