Potato

Unlocks once you've harvested 100 Carrot, 120 Celery, 90 Lettuce and 40 Onion in all; unlocking it is then free.

A seed costs 9 spare parts and grows for 5m 10s (4m 8s on fertilized soil), needing water 5 times on the way: it stops growing until it's watered. It gives 7 harvests, growing back from scratch after each one.

Each harvest is one Potato and 7 spare parts: 49 from one seed, 40 more than it cost, over 36m 11s of growing. In a Biofuel Converter each one is worth 6 biofuel.

A Reaper chip can improve its grow time, watering, harvests, biofuel or earnings.