Once the lavender is de-headed i start the fun bit off crushing it all with my fingertips. This is so relaxing as well as intoxicating. To this i add about 1/2 tsp of pure lavender oil and mix it well in with an old wooden spoon. If you can find orris root powder add 1/2 Cup of it into the mix. Orris root powder helps to preserve the lavender oils (smell) with-in the potpourri. I had trouble sourcing it. I ended up getting some off a friend who had purchased hers many years ago.