Shop

The Shop is where you spend Potato Coins to buy Upgrades. It is unlocked when you unlock a tier 2 potato.

Automation
There are currently 3 kinds of automation. The Auto Planter, Auto Harvester, and the Auto Seed Crafter.

Auto Planting
The "Auto Planter" upgrade automatically activates a checkmark next to the "Plant a Seed" button that automatically plants a seed, even if there is a potato in your inventory. the cost for the auto planter is 25 Potato Coins

Auto Harvester
the harvester automatically harvests the highest available tier of potato, unless there is a potato in the inventory. the price of the harvester is 200 Potato coins

Auto Seed Crafter
the seed crafter automatically takes a potato out of your inventory and turns it into seeds. the price for the seed crafter is 5 Potato coins

Other upgrades
Other than automation, you have other upgrades.

Fertilizer
The fertilizer multiplies your growth speed by 1.25. The starting price is 5, and multiplies by 100 every time you purchase it. It caps at level 5.