Celery

Unlocks once you've harvested 18 Wheat, 33 Radish and 17 Leek in all; unlocking it is then free.

A seed costs 3 spare parts and grows for 3m 40s (2m 56s on fertilized soil), needing water 5 times on the way: it stops growing until it's watered. It gives 5 harvests, growing back from scratch after each one.

Each harvest is one Celery and 5 spare parts: 25 from one seed, 22 more than it cost, over 18m 21s of growing. In a Biofuel Converter each one is worth 3 biofuel.

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