Woodruff's plexus is seen at
Woodruff's Plexus - Site of posterior epistaxis in adults. Plexus of veins situated inferior to posterior end of inferior turbinate Ref: Dhingra 7e pg 197.
Anteroinferior pa of superior turbinate
Middle turbinate
Posterior pa of inferior turbinate
Anterior pa of inferior turbinate
Nose and paranasal sinuses