The farm is the third cheapest building you can purchase with an initial cost of 1,100 cookies. Each farm initially produces 8 cookies per second by farming cookies.
The farm also unloks the garden minigame when upgraded to level one with a sugar lump.
The production of farms can be enhanced with these upgrades:
Own 1 farm
Farms are twice as efficient. "Rake in the dough!"
Own 5 farms
Farms are twice as efficient. "It's chocolate, I swear."
Own 25 farms
Farms are twice as efficient. "A relative of the breadfruit."
Own 50 farms
Farms are twice as efficient. "All-natural mutations."
Own 100 farms
Farms are twice as efficient. "Staring at your crops with mischievous glee."
Own 150 farms
Farms are twice as efficient. "There's no such thing as over-watering. The moistest is the bestest."
Own 200 farms
Farms are twice as efficient. "A sugary parasite whose tendrils help cookie growth. Please do not breathe in the spores. In case of spore ingestion, seek medical help within the next 36 seconds."
Own 250 farms
Farms are twice as efficient. "Taking care of crops is so much easier when your plants can just walk about and help around the farm. Do not pet. Do not feed. Do not attempt to converse with."
Own 300 farms
Farms are twice as efficient. "Made by people, for people, from people and ready to unleash some righteous scorching pain on those pesky insects that so deserve it."
Own 350 farms
Farms are twice as efficient. "Ah, yes. These help quite a bit. Somehow."
Own 400 farms
Farms are twice as efficient. "You have to import these from far up north, but they really help areate the soil!"
Purchasing 15 Farms allows for the purchasing of a Grandma upgrade and a new Grandma type.
15 farms and 1 grandma
Grandmas are twice as efficient. Farms gain +1% CpS per grandma. "A nice farmer to grow more cookies."
Farms have the lowest CpS of any fully upgraded Building when a reasonably large number of Buildings have been purchased, meaning that their greatest use later on is improving the CpS of fully upgraded Cursors. The 150th Farm costs 533 billion cookies but only increases the output of Farms by 20 CpS (before bonus multipliers) with all upgrades; it however contributes 26,520 CpS (plus multiplier) to the Cursor rate and per mouse click, if you have 200 cursors and the Quadrillion Fingers upgrade - a 1326x difference(!). (Please update numbers)
Farms were not included in the Classic version of Cookie Clicker.
Farms are currently the worst buildings in game. It is not recommended to buy farms for CPS mid-late game, as they are only really useful for Synergy effects.
Statistically, Farms are the most efficient building to buy first!
The name given to the achievement 'I hate manure' may be a reference to Back to the Future, as in the films this line is often quoted by a member of the Tannen family, when they end up in a pile of manure.
Upgrade "Wheat triffids" is a reference to The Day of the Triffids, post-apocalyptic novel by John Wyndham.