Red Greed Will Seed
From the Facility Passageway Safe Room, exit the room and head east through a door. Keep heading forward, passing an elevator on the right, through another door. Follow the hallway to the end to reach yet another door. Climb up on the ledge to the right of the door and head into the vent. You will emerge in a giant circular room. The seed can be found at the top of this room. You will need to climb up some metal canisters, a couple of ledges and use your grappling hook to reach it.
Green Greed Will Seed
From the Export Line Safe Room, exit the room and take a right heading to the assembly line. Climb across the first machine that you disabled. As soon as you jump down off the machine, take a left and head down a small flight of stairs to reach a server rack. Interact with the rack to disable the lasers guarding the room containing the seed. You can use your grappling hook nearby to access a shortcut leading to the Will Seed. After taking the shortcut, you’ll end up on some pipes near the ceiling. Head to the ledge and follow it around to find a vent shaft. On the other side of the vent shaft, you will find the room that contains the seed.
Blue Greed Will Seed
The last Will Seed can be found in the Transfer Line just before reaching the treasure. It will be on the northeastern side of the map and you will need to use the airlocks to reach it.