Cauliflower

Unlocks once you've harvested 110 Leek, 70 Celery, 40 Corn and 40 Lettuce in all; unlocking it is then free.

A seed costs 7 spare parts and grows for 4m 50s (3m 52s on fertilized soil), needing water 7 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 Cauliflower and 6 spare parts: 42 from one seed, 35 more than it cost, over 33m 49s of growing. In a Biofuel Converter each one is worth 5 biofuel.

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