Factorio Forums

Adding trash slots to agri towers would allow seeds that spoil to work more naturally ingame. For example if a seed spoils while being inserted, it will clog up the inserter, unlike what happens with biochambers, where the spoilage result is inserted into the entity's trash slot.
As you can see, the inserter cannot insert the spoilage into any trash slot, as they dont exist, locking the insertion of new seeds into the tower.