Pumpkin seeds: little seedy bits of pumpkiny promise!
How to Obtain
Pumpkin seeds can be looted year-round or traded for in a market world. Typically, they drop from chests in a clump of three at a time.
How to Use
Place on backdrop in a purified temperate world with clear sky above so rain can reach the seed. Give it a few hours and you'll have a pumpkin, yay! Pumpkins can be grown any time of year.
Added in the Halloween update in 2014.
Although harvesting pumpkins with a spade will seem to occasionally allow you to recoup seeds -- and you will see a message to that effect -- no seeds will actually go into your inventory. This glitch remains in effect as of December 2018. Bummer!