Thorn Bush Seeds are items used to grow thorn bushes, plants which deal damage to players touching or attacking them (useful for base defence). They were added in the Merry Christmas update. Thorn bush seeds used to spawn naturally in the forest, and could be obtained by hitting them. Now you need to craft it with 16 thorn bush, or buying them for 10 Tomatoes. In order for them to grow Thorn Bushes, a player has to plant the seeds after mining them. They can be planted anywhere in the forest and do not require a fire to be planted. They can also be planted in the winter or ocean, with a plant plot and bridge (only in ocean).
When planted, thorn bush seeds look similar to berry seeds, but green. Thorn bush seeds grow into a thorn bush 4 minutes after planting, then will grow every 15 seconds. They will be reverted to a planted seed when the thorn bush is harvested.
Thorn Bush Seeds will grow into harvestable thorn bush 20% faster when grown in a plant plot, 20% faster when using a peasant's tunic, and 40% faster when using a winter peasant's tunic (effects from tunic and plant plot stack).
Thorn Bush Seeds have a limited amount of health (1000), and last longer when harvested by hand, instead of tools or weapons. If not damaged in any way, thorn bush plants naturally de-spawn after 8 days.
Every 3 minutes, Thorn Bush plants dry up. When a Thorn Bush plant is dried up, it will no longer be able to grow after being harvested. Dried Thorn Bush plants can be replenished by watering them with a full watering can.