Layering is a means of plant propagation in which a plant stem is pegged down onto the soil while it is still attached to the parent plant. This encourages roots to grow at the point where the stem touches the ground. It works best for herbs with flexible stems, such as rosemary, lavender, sage, tarragon, thyme and Roman chamomile.
Take a stem and remove any leaves at the point where it is to be pegged down. If the stem is brown and woody, scrape the surface with your fingernail to expose the green tissue beneath it. Then hold the stem down using a wire bent into a U-shape. Bury the stem in contact with the soil about 2cm deep. After several months, when roots have formed, cut the new plant away from the parent plant and pot up or reposition.