Release 233: New Block Types and Closed Storage are here!

[Venom]

@SamF

EDIT: in a slight change of plan, players will now craft the new items from Spooky Orbs, dropped from Fungus. Spooky seeds will be planted to grow spiders in trellis blocks, creating the most frightening crops you’ll ever see.

Players with existing seeds will find them converted to orbs, which are used to craft the lanterns and dolls. These can also be used to craft spooky seeds, which are used to create Spiders. Spiders can be placed anywhere in the world and do not wither - these are props, not decorative crops.

I think after the initial edit they changed it again to automatically convert them.