EastScape Wikibuilt from the game itself
Coalcap spawn
“Plant it in a fungus bed in your cellar (Fungiculture 95) with 3 compost. It grows coalcap, and gives spawn back.”
How to get it
- Scraped up with the shroom 35% of the times you pick wild Coalcap (Fungiculture 95), and given back by every bed you harvest.
Grows
Plant it in a fungus bed in your cellar (Fungiculture 95, 3 compost): grows 
Coalcap in about 380 minutes, and gives spawn back.