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!"
Global seed vault
Own 450 farms
Farms are twice as efficient. "An enormous genetic repository that could outlive an apocalypse. Guarantees the survival of your empire, or at the very least its agricultural components, should civilization fall. Which should be any day now."
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.