Pumpkin

Unlocks once you've harvested 350 Cauliflower, 430 Potato, 220 Turnip and 270 Tomato in all; unlocking it is then free.

A seed costs 19 spare parts and grows for 6m 54s (5m 31s on fertilized soil), needing water 5 times on the way: it stops growing until it's watered. It gives 10 harvests, growing back from scratch after each one.

Each harvest is one Pumpkin and 10 spare parts: 100 from one seed, 81 more than it cost, over 1h 9m of growing. In a Biofuel Converter each one is worth 8 biofuel.

On some patch tiles a ripe Pumpkin can grow into a giant one instead (1 in 150), worth four crops for each tile it covers but no spare parts; it ends the seed's harvests and clears what grew under it. Rarer still, it can turn golden (1 in 4,096).

In October (going by the computer's clock) it grows as a jack-o-lantern instead: each tile planted gets one of 6 carved faces, picked at random, and the crop shows as a jack-o-lantern everywhere else too.

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