Allows interleaving strains of some plants.
Only available where Gardening has already been opened. Calls for some items only available after Horticulture is researched.
Teachable in 7 lessons.
Once learned, allows you to build a Toxin Kitchen (2500 bricks, 1000 firebricks, 30 glass jar, 1 thermometer, 50 gold wire and 1 medium sapphire) in any compound. You also need to learn Botanical identification level 1 (10 of each Bleeding Hand mushrooms, Colt's Foot mushrooms and Iron Knot mushrooms) to find only one option atm, 'Make a batch of Nut's Essence'.