Patchouli perfume

Question

Where does the perfume come from? Do the leaves or the flowers of Patchouli plants hold the perfume?

Answer 1

The leaves are harvested for the fragrance and specifically the top 3 to 4 sets of leaves hold the most fragrance.
The leaves are distilled to extract the oil.

https://www.gardeningknowhow.com/edible/herbs/patchouli/growing-patchouli-herb-plant.htm