Rhubarb

Unlocks once you've harvested 440 Red Bell Pepper, 400 Yellow Bell Pepper, 340 Cucumber and 80 Black Beans in all; unlocking it is then free.

A seed costs 75 spare parts and grows for 11m 28s (9m 11s on fertilized soil), needing water 10 times on the way: it stops growing until it's watered. It gives 17 harvests, growing back from scratch after each one.

Each harvest is one Rhubarb and 21 spare parts: 357 from one seed, 282 more than it cost, over 3h 14m of growing. In a Biofuel Converter each one is worth 15 biofuel.

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