Deathweed Seeds

Deathweed Seeds were introduced in the 1.0.5 patch.

They can be found when harvesting Deathweed blooming during a Blood Moon. Harvesting it at any other time will net you the Deathweed itself, but no seeds.

Deathweed Seeds can be placed in empty Clay Pots, corrupted grass, or Ebonstone and grown into additional, harvestable Deathweed. Potted Deathweed will grow anywhere, even outside of The Corruption.

Keep in mind as of 1.0.5 you can no longer harvest flowers or herbs out of Clay Pots with a standard bladed weapon; instead, use your Pickaxe and left-click on the flower or herb above the Clay Pot you wish to harvest out of.