Yam

Unlocks once you've harvested 550 Green Chili, 360 White Pumpkin, 350 Rutabaga and 160 Red Corn in all; unlocking it is then free.

A seed costs 99 spare parts and grows for 14m 20s (11m 28s on fertilized soil), needing water 10 times on the way: it stops growing until it's watered. It gives 20 harvests, growing back from scratch after each one.

Each harvest is one Yam and 30 spare parts: 600 from one seed, 501 more than it cost, over 4h 46m of growing. In a Biofuel Converter each one is worth 20 biofuel.

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