Plants and crops
Green 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)
Area 7 (tier 5), Pass-N-Gas Truck Plaza (tier 3).
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.