You’re able to grow your own herbs in This War of Mine: The Little Ones using the craftable Herbal Garden. It requires 30 components, 30 wood, and two parts and can only be built from the Improved Workshop first, so be sure to get that.
An Herbal Garden grows herbs. These are extremely useful as they can craft Medications, Herbal Meds, and Cigarettes. Additionally, they break down raw food and vegetables into Fertilizer, which can be used as bait in a trap or for the Vegetable Garden.