Crops

Crops can be planted in gardens for a given amount of gold. Once planted, they will take a certain amount of time to grow. After they grow, players may harvest them for gold and XP. You can speed up their harvesting with the use of Gro.

Players can choose to have a push notification sent to them when their crops are ready to harvest.

If crops are not harvested within a certain time, they will rot and you will need to clean the garden before planting new crops

Overview
The following chart has the rates per hour for each of these crops for both gold and XP.

Harvesting Window
There is a limited time between when crops get ripe and when they are no longer good. There doesn't seem to be any hard connection between growth time and the length of the harvesting window.

Corn has a harvesting window of 10 minutes, while you get 15 minutes with Wheat.

How efficent a crop is depends alot on how soon you harvest them. Theoretically you could get 400 gold in an hour with corn, if you did everything perfectly - or if not you could get as few as 27.91 coins in an hour if you harvested at the absolute last second each time.