Wheat
Wheat tiles produce Food.
Connected wheat tiles form a larger wheat field.
Smaller wheat fields are often less efficient,
however their efficiency goes down when there are more than 9 tiles.
Nerdy Details
$$x = e^{-\left(\frac{w-9}{s}\right)^2}*2.4+1$$-
w: Number of wheat tiles that are adjacent to this tile or connected to neighbouring wheat tiles -
s: $\begin{cases} 4 & w \leq 9 \\ -2.5 & \text{ else } \end{cases}$ -
x: Production rate