Harvest your lavender before it goes brown and woody.
Hang it upside down to dry for about a week.
Remove dried bits by running your hand in the opposite direction of the growth (top to bottom).
Place the lavender a jar and save for sprinkling on your carpets before you vacuum.
Keep the opened jar in your laundry closet to keep it smelling good.
You can also burn lavender in your fire but put it in the middle of the sandwich of wood you're burning so it doesn't spark out of the fireplace.