...and the easiest way to get new plants yet! Clip a green stem 4 to 6 inches long.
Angle your cut slightly.
Take the lower leaves off of the stem so that none will be under water. Then simply place in a glass or vase for a few weeks until you have roots, and plant it!
This is my propagation station. It's a sunny kitchen window that faces west, and I often experiment with new cuttings to see what will root. Here we have oregano and sage started, and the middle plant was given to me by a friend to root. It evidently attracts butterflies; we'll know soon enough since it's nearly ready to pot. You'll notice from the pit suspended in water by toothpicks on the lower shelf that I'm hoping for an avocado tree too. I'm not the best gardener (Sam makes me apologize in advance to the cilantro every time I buy it), but we'll see. Maybe I'll improve since I know you're watching.