Evolutions

Evolutions turn a maxed base weapon into a stronger weapon. Unions merge two weapons into one. Item evolutions upgrade an item once a passive reaches max level. All recipes below come straight from the game's recipe tables.

#How evolving works

Verified from the game code (sim-BkfBhQfw.js):

• Evolutions, unions and item evolutions only happen when a chest is opened (elite, boss, cursed-extra and poteto gift chests, and the Tater Slots jackpot). Potato Crates, the Fry Cart and the Microwave give items, not chest rolls. See Chests.
• Weapon evolution: the base weapon is at max level (8) and you own the catalyst at any level.
• Union: you own both partner weapons (or the evolution of one); each is max-level base or evolved, and at least one is a max-level base weapon. The union takes the first weapon's slot and removes the second, freeing a slot. The game's text simplifies this to “Unites with X into Y when both reach LV 8”.
• Choice: if a weapon can both evolve and unite, the chest asks “Evolve or unite?”.
• Item evolution: you hold the base item and the catalyst passive is at max level (5). On the next chest, every copy of the item turns into the evolved item, and the base item stops dropping.
• There is no time gate (chests.evolutionGateSec = 0).
• From level 4 of a base weapon, the level-up guarantees its missing catalyst passive as the last card if you have a free passive slot (see Level-up).

#Weapon evolutions

Result	Base weapon	Catalyst	Catalyst type
Big Fry	Small Fry	Fertilizer	Passive
Bottomless Sack	Grab Bag	Sprouting Eyes	Passive
Cast Iron	Frying Pan	Starch Plating	Passive
Cold Storage	Root Cellar	Slow Cooker	Passive
Eternal Sprouts	Sprout Satellites	Slow Cooker	Passive
Factory Reset	Reset Button	Four-Eyed Spud	Passive
Ghee Glide	Butter Streak	Spud Sneakers	Passive
Golden Harvest	Potato Rain	Golden Fry	Passive
Gratin Arc	Starch Chain	Hot Sauce	Passive
Gravy Flood	Gravy Boat	Potato Magnet	Passive
Hash Bulwark	Hash Brown Shield	Starch Plating	Passive
Hashnado	Hash Boomerang	Sour Cream	Passive
Inferno Basket	Deep Fryer	Bacon Bits	Passive
Kettle Cyclone	Chip Shuriken	GPU	Passive
Landmine Harvest	Tater Mines	Rotten Spud	Passive
Loaded Dice	Spud Dice	Four-Eyed Spud	Passive
Mandoline Fury	Peeler	Gravy Heart	Passive
Mashquake	Mash Wave	Big Bowl	Passive
Moon Cleaver	Mezzaluna	Rotten Spud	Passive
Overgrowth	Seeker Sprouts	Fertilizer	Passive
Permafrost Fries	Frozen Fries	Thick Skin	Passive
Pressure Cooker	Steam Vent	Root Network	Passive
Railfry	Fry Lance	Spud Sneakers	Passive
Rösti Storm	Rösti Disc	Starch Plating	Passive
Sack of Russets	Spud Lob	Butter Pat	Passive
Salt Flats	Salt Line	Spud Sneakers	Passive
Spicy Hot Potato	Hot Potato	Hot Sauce	Passive
Spud Grid	Potato Battery	Root Network	Passive
Spudzooka	Spud Cannon	Hot Sauce	Passive
Stand Mixer	Whisk Vortex	Big Bowl	Passive
Taproot Eruption	Root Spikes	Masher Grip	Passive
Thousand Fries	Fry Knives	Salt Shaker	Passive
Thunder Tuber	Starch Bolt	Sprouting Eyes	Passive
Tot Gatling	Tot Toss	Chives	Passive
Waffle Cut	Julienne Dash	Butter Socks	Passive
Gem Catapult	Gem Sling	Potato Magnet	Passive
Mash Avalanche	Mash Snowball	Masher Grip	Passive
Potato Patch	Seed Potato	Fertilizer	Passive
Spark Corral	Spud Fence	GPU	Passive
Tailgate Party	Tailgate Fries	Butter Pat	Passive
Tater Minigun	Locked Gatling	Masher Grip	Passive
Tater Twister	Tater Twirl	Salt Shaker	Passive
Tot Cavalry	Tot Stampede	Butter Socks	Passive
Wildfire Roast	Hot Streak	Thick Skin	Passive

#Unions

A union consumes both weapons and frees a weapon slot.

Result	Weapon A	Weapon B
Fry Brigade	Fry Cook Sentry	Tater Tot Pup
Spud Artillery	Spud Lob	Spud Cannon
Starch Supercell	Starch Bolt	Starch Chain

#Item evolutions

The catalyst passive must be at max level (5).

Result	Item	Catalyst passive (level 5)
All-Seeing Spud	Wandering Eyes	Four-Eyed Spud
Bonfire Spud	Coal-Baked Spud	Hot Sauce
Fry Volcano	Porcupine Spud	Starch Plating
Glacier Spud	Freezer Burn	Slow Cooker
Kaboom Spud	Boom Spud	Rotten Spud
Magma Croquette	Spicy Croquette	Big Bowl
Meteor Russet	Heavy Russet	Masher Grip
Storm Tot	Static Tot	Root Network

#Catalysts by use

Passives that unlock more than one recipe are worth keeping a slot for.

Catalyst	Recipes	Unlocks
Starch Plating	4	Cast Iron, Hash Bulwark, Rösti Storm, Fry Volcano
Hot Sauce	4	Gratin Arc, Spicy Hot Potato, Spudzooka, Bonfire Spud
Masher Grip	4	Taproot Eruption, Mash Avalanche, Tater Minigun, Meteor Russet
Fertilizer	3	Big Fry, Overgrowth, Potato Patch
Slow Cooker	3	Cold Storage, Eternal Sprouts, Glacier Spud
Four-Eyed Spud	3	Factory Reset, Loaded Dice, All-Seeing Spud
Spud Sneakers	3	Ghee Glide, Railfry, Salt Flats
Rotten Spud	3	Landmine Harvest, Moon Cleaver, Kaboom Spud
Big Bowl	3	Mashquake, Stand Mixer, Magma Croquette
Root Network	3	Pressure Cooker, Spud Grid, Storm Tot
Sprouting Eyes	2	Bottomless Sack, Thunder Tuber
Potato Magnet	2	Gravy Flood, Gem Catapult
GPU	2	Kettle Cyclone, Spark Corral
Thick Skin	2	Permafrost Fries, Wildfire Roast
Butter Pat	2	Sack of Russets, Tailgate Party
Salt Shaker	2	Thousand Fries, Tater Twister
Butter Socks	2	Waffle Cut, Tot Cavalry
Golden Fry	1	Golden Harvest
Sour Cream	1	Hashnado
Bacon Bits	1	Inferno Basket
Gravy Heart	1	Mandoline Fury
Chives	1	Tot Gatling