RIP Jack O'Lantern

I have dark spots,
my mouth now droops.
My flesh and skin
has turned to goop.

I'm not a zombie,
my name is Jack.
I used to shine bright,
now my guts are black.

In the compost heap
I currently sit.
I'm decomposing
lickity-split.

Soon I will be
mixed into the ground
helping next year's crop
become plump and round.