Southeast Piazza (Greenhouse)
Dimensions: 21' 7"x 12' 4"; ceiling 11' 7 3/4"
Purpose of Room: Greenhouse for growing plants; location of Thomas Jefferson's workbench, where he is known to have made locks and chains; possibly home to a pet mockingbird
Furnishings of note: work table and tools, as well as flowers, seeds, and flats for sprouting see
Primary Source References
1808 January 22. (Ann Cary Randolph Bankhead to Jefferson). "I have not been to Monticello since we cane from there but Jefferson was there the other day and says that the green house is not done." 
1828 August 10. (Mary Jefferson Randolph to Ellen Wayles Randolph Coolidge). "Then we have the sitting room adjoining in which two more can be comfortably lodged, and the green house a very convenient little appendage to our bed chambers." 
1. Edwin M. Betts and James Bear, Jr., eds. Family Letters of Thomas Jefferson (Columbia, MO: University of Missouri Press, 1966, Rep. Charlottesville: Thomas Jefferson Memorial Foundation, 1986), 314.
2. Ibid, 323.
3. Ibid, 369.
4. Ibid, 416.