The Massachusetts Public Health Council will vote Thursday on a $1 billion proposed expansion to Boston Children's Hospital.
The vote is expected to draw protests from the group, Friends of Prouty Garden.
The expansion includes a new building on the Longwood campus, which jeopardizes the future of the Prouty Garden.
The green-space is considered an escape for patients and their families.
The vote is the last step for the hospital to gain state approval.