When doing the Lost Farm Valley quests, Green Pitaya requires 20 faints when there are only 30 of them in ba_lost, all other Pitayas are of 50 counts. My suggestion is increase Pitaya by 20 or reduce the quest requirements by 5 to make the quests more streamlined.
Edit: I also believe the daily quests revolving Pitayas doesnt have EXP ? I could be wrong about it.