Purple Potato

Unlocks once you've harvested 480 Blue Grapes, 290 Zucchini, 120 Blue Corn and 190 Green Chili in all; unlocking it is then free.

A seed costs 88 spare parts and grows for 14m (11m 12s on fertilized soil), needing water 12 times on the way: it stops growing until it's watered. It gives 19 harvests, growing back from scratch after each one.

Each harvest is one Purple Potato and 24 spare parts: 456 from one seed, 368 more than it cost, over 4h 26m of growing. In a Biofuel Converter each one is worth 18 biofuel.

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