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Ideally, the tips should have 2-3 leaf nodes. Remove the stem immediately below a leaf node. Cut off the leaves from the bottom half of the stem tips. Moisten it thoroughly. Repeat the same for each stem. Cut off any leaves that touch the sand. Use a spray bottle every day to keep the sand moist. Move it to a container with potting soil or a sunny garden spot.

Summary:
Cut stem tips from a healthy carnation plant. Fill a planting container with coarse sand. Push the stem tip about 1/3-1/2 of the way into the sand. Place the container in a spot where it will receive even, indirect sunlight. Use a trowel to loosen the cutting from the sand one month after it grows roots.