Barty Crouch Jr. (while disguised as Moody) summons Dobby to the staffroom on the pretense of collecting dirty laundry and then makes sure the elfs hears him having a very loud discussion with McGonagall about the second task and the possibility of Harry using gillyweed to complete it (GF26, GF35).
This must have occurred the night before or the morning of the second task because Moody says that Dobby immediately went to Snape's office for gillyweed and then went to find Harry (GF35).
Dobby learns about gillyweed from the fake Moody
Date February 23rd, 1995
Certainty Inferred from canon
Location in Canon GF26: The Second Task GF35: Veritaserum
Type of Event Wizarding world
View 0 thoughts swirling around the pensieve. Add your own.
Tags: help information overheard plants