Don't know where to get dandelion, mint, and rib grass? You definitely need the Herbalist’s hut.
   
Just build it on the Flower Glade location behind the wolves from level 23. 
Find a suitable place and build the hut.
   
With the help of the Herbalist’s hut you can get not only your guaranteed trophy - mint  but also some rare resources like dandelion and rib grass. 
   
Upgrade the Herbalist’s hut and hire more workers to get more mint and have bigger chances to get rare resources.
   

With love,
Your Farland Team