Proloque

Ever since Harry could remember he has always gotten a red rose on his birthday.

Every year a red rose came to the Dursley's in an owls beak and he has kept every single rose hidden from the Dursley's.

In Harry's 4th year at Hogwarts the rose came once again but this time Hedwig delivered it instead of a dark black or brown owl.

How does Hedwig know the person sending him these roses?
Who is sending him these roses?
Why are they sending him roses?
Why only on his birthday and never any other day?