Green Thumbs is a challenge in Makopa Jungle. It is unlocked by cutting down all twelve stinkflowers.
Stinkflowers can be cut by machetes or other blade like objects. Two stinkflowers are hard to find. For the first one, use the parrot to go to the left of the third area. Then take the parrot back to the second area for another stinkflower.
- Cactus McCoy literally does have green thumbs, as he is a cactus.