Fill the clay pot with an even mixture of peat moss and perlite. Rosemary thrives in lighter soil, and this combination lets it breathe well.
Snip off the bottom leaves of your rosemary plant cutting. The cutting should be about 2 to 2.5 inches long. If you're working with a fully rooted rosemary plant that you are transplanting, carefully dig up the plant with a spade, using care not to damage the root system. Rosemary roots deeply and depends on a stable root system to survive.
Dip your rosemary cutting into rooting hormone, up to 1/4 inch up the stem. If you're working with a fully rooted plant, you can skip this step.
Insert the cutting or plant into the newly potted soil and lightly cover the soil in around the plant. If the soil is dry, water the plant well.
Place your rosemary plant in an area with southern exposure, as rosemary enjoys lots of sunlight. If it is in a window and is a larger-sized plant, you may need to rotate it periodically to ensure that the entire plant receives the sunlight. If you notice any wiry growth, it's due to inadequate sunlight. Artificial light is a good alternative if you don't have an option to get the plant more natural light.