If we make the fountain an infinite source of food, would that make the center castle too powerful? Right now the fountain is just for decoration, but I agree we need to do something with it. Maybe it irrigates the meadow slowly, but you can still dry it out if you over-plant it? At least that way you don't need to wait for the rain.
As seen in this post:
The fountain is going to be removed soon in favor of wells around the map that you can draw water from.
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