Lavender plant: Purple flower found growing in the wild and in some POIs. Can be used to make lavender seeds (no unlock required), and/or lavender oil (crafted in a campfire, cooking pot required, costs 10 flowers, 1 water, and 1 cloth, treats 3% despair).
Lavender flowers can be found in loot and trader stock, and Lavender seeds in trader stock.
Lavender oil can be found in medical loot.
This sounds perfekt