Addition - West Wing - Greenhouse is a schematic in Skyrim: Hearthfire. It is used by the Player Housing system.
Add the West Wing Greenhouse using the Drafting Table.
Note that You can only add one West Wing section to a house.
Also you can only start work on expanding your home after completing the Main Hall
The Greenhouse give you a place to grow food and alchemy ingredients.
Function[edit]
Use this schematic in the Drafting Table to add a West Wing section containing a Greenhouse