Fill the growing container with the sphagnum moss. Spray the moss with water from the spray bottle to make it evenly damp.
Cut a stem from a healthy and actively growing Nepenthes plant. Select a climbing stem with leaves and remove the tip of the stem so that it has two or three leaves. Cut the stem off diagonally just beneath a leaf node with the pruning shears.
Insert the stem into the center of the prepared container, pushing it about 2 inches beneath the sphagnum moss.
Press down on the moss gently with your fingers to create a firm base to keep the stem upright.
Place the plastic bag over the stem in the container and secure the bag to the rim of the container with the rubber band.
Place the container in a location that receives indirect sunlight with a temperature of approximately 70 degrees Fahrenheit.
Remove the bag daily and spray the sphagnum moss with water to keep it moist. Replace the bag and the rubber band. The rooting process will take between one and 12 months, depending on the health of the parent plant and the Nepenthes species.
Transplant the Nepenthes plant to a permanent growing container onde the plant begins to produce new growth. New growth indicates new roots forming beneath the moss.