Plants and crops
Brown 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 (6 POIs)
Champions Coliseum (tier 5), Don Vittorio Spagetto Residence (tier 4), Stand Tower (tier 4), KLZ Radio (tier 3), Meat You Here Butchery (tier 3), The Eisele Residence (tier 1).
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.