Plants and crops
White Fern
Furniture can make your place look pretty but it usually has little defensive value.
Crafting
Craft at Backpack · makes 1
Crafted as 
Potted Plant: pick this one of its variants when you place it.
Plant Fibers× 4
Clay Soil× 8
Drops when destroyed
- Clay Soil× 6
When it collapses
- Clay Soil× 6
Where to find (2 POIs)
Navezgane County Jail (tier 5), St. Sera's Church.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.