Root of Asphodel is an ingredient used in potion brewing.  As of August 2013, the entire plant (including the root) can be found in Harry Potter and the Prisoner of Azkaban , Chapter 17 , Moment 1. First, hover your mouse pointer over Harry's wand to illuminate it. Asphodel will appear as a white flower in the midst of the roots of the Whomping Willow.


Root of Asphodel is mentioned in the description of Infusion of Wormwood:

“By mixing an infusion of wormwood with powdered root of asphodel you can make a sleeping potion so powerful it is known as the Draught of Living Death.”


* This potion is only mentioned, and cannot be made or found on Pottermore.

See also