The grand winery provides the following ability Synergistic Crops (Passive): The Grand Winery grants all Villagers within a 6.25 tile radius +60% Olive Oil gathering rate. This buff lasts for 20 seconds outside of the aura.
However the buff does not last for 20 seconds outside the aura, it only lasts for 10 seconds so this drastically reduces the number of farms that can gather at increased rate around the winery.