What they didn't tell the Mayor or the Colonel was that the Garden Charm in the fields for Palm Oil was an incomplete one compared to the ones that they used at home in the Fae Forest.
Those ones included one of Wolfe's locally famous mana gathering Arrays so that they never needed to be charged by the Witches and would continue to maintain the perfect environment for their crops all year round.
This version would require a fair bit of work on everyone's part to keep it charged and to harvest the Palm fruits every few days, but the result should be a more cohesive group of villagers who were making a lot of money together.