Choose a healthy, mature mint plant to take your sprigs from. These cuttings will grow into an exact replica of the parent plant, so pick one that you like.
Clip stem tips about 6 inches long with clean, sharp scissors. Pick the leaves off the lower half of the sprig.
Fill a clear drinking glass about half full of water. Immerse the clipped end of the stem in water. Make sure no leaves come into contact with the water.
Set the mint sprig on a warm, bright windowsill out of direct sunlight. It will begin forming visible white roots in about a week.
Change the water every other day.
Plant the sprig in a 4-inch pot of potting soil when the roots are about 1 inch long and new leaves begin to emerge.
Water the mint plant thoroughly to evenly moisten the soil, but not so much that it’s soggy or wet. Water again when the soil begins to feel dry.
Set the mint plant in a bright spot where it will receive some direct sun every day.