Kill the evil plants that infest Hakunin's garden

This quest can be recieved from Hakunin in Arroyo Village. His garden is being ruined by (spore plants?), and he wants them cleared out. As the Chosen One, you're the only person who can help.

The only way to solve this quest is by killing the plants in combat.

Reward:
 * 100 EXP
 * Hakunin will mix up healing powders for the player character if the correct ingredients are brought to him (what are they? where can they be found?).