Filling can only occur at a blue Fertilizer Tank. There are two such tanks on each map: one at your farm, and the other at the Garden Center. They should be quite visible from a distance, due to their striking color.
Filling can only occur at a blue Fertilizer Tank. There are two such tanks on each map: one at your farm, and the other at the Garden Center. They should be quite visible from a distance, due to their striking color.