Sprinkler

A device that waters plants to boost production. No need to manually tend to plants anymore.
Overview
Sprinkler is a farming support building that boosts the growth speed of nearby plants. Any plant within 3 tiles on either side of the Sprinkler receives a +50% growth speed bonus, making it a simple way to improve the efficiency of garden layouts.
Its area of effect is generous enough to cover plants that are only partially within range. In particular, it still works properly with 
When planning a farm, it is best to place the Sprinkler so that its range overlaps as many planted tiles as possible. Because the effect applies to plants rather than the garden structure itself, careful placement matters more than the size of the plot. Using one or more Sprinklers alongside densely packed gardens can significantly improve crop growth timing and overall farm productivity.
Official description
A device that waters plants to boost production. No need to manually tend to plants anymore.