Fill a pot or flat with sterile potting soil that drains well or horticultural vermiculite.
Pull a side shoot of young new growth away from the main stem of the lavender plant. Grab the top of the branch and break off a piece 4 to 8 inches long, leaving a thin strip of bark, or heel, attached. The heel is important to the lavender cutting since this is where the roots of a new plant begin to develop.
Trim off any excess bark with a knife.
Remove the lower set of leaves on the cutting to create a length of bare stem.
Wrap the cuttings in moist paper towels or wet newspaper if you are making several cuttings at one time. Place them in a plastic bag to keep moist and keep them in a cool spot until ready to plant.
Dip the lower end into water. Nip off any flower heads at this time. Insert the cut end deeply into the soil in the pot. Only about 1 inch of the plant should be above ground.