an oak tree
The tree in "To Kill a Mockingbird" has knots from an old Negroes were hanged where Boo Radley put gifts for Scout and Jem. This sickness may symbolize the dark history and prejudice that the town holds.
gum
boo radley
Boo Radley secretly placed them there.
it represents jem's childhood
Tree and flowers
Yes.
a key
Boo Radley
Mr. Radley fills in the knot hole
it's in chapter 6
Boo Radley left gifts in the oak tree for Scout and Jem in "To Kill a Mockingbird." Boo was a reclusive neighbor who wanted to reach out to the children in a subtle and kind way, showing his care and appreciation for them.