Eggplant

Unlocks once you've harvested 240 Cauliflower, 260 Potato, 90 Turnip and 60 Green Peas in all; unlocking it is then free.

A seed costs 12 spare parts and grows for 5m 40s (4m 32s on fertilized soil), needing water 8 times on the way: it stops growing until it's watered. It gives 9 harvests, growing back from scratch after each one.

Each harvest is one Eggplant and 9 spare parts: 81 from one seed, 69 more than it cost, over 51m 2s of growing. In a Biofuel Converter each one is worth 7 biofuel.

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