This answer is in chapter 7. Mr. Nathan Radley closes up the knothole becasue he doesn't want Boo putting anything else in there.
In "To Kill a Mockingbird," the knothole in the tree is cemented up by Nathan Radley, Boo Radley's brother, as a way to prevent Boo from communicating with the children. This action symbolizes the Radley family's attempt to isolate Boo from the outside world and maintain their reclusive lifestyle.
Jem and Scout discover that Mr. Radley has cemented up the knothole in the oak tree where they had been finding all the treasures.
In "To Kill a Mockingbird" by Harper Lee, Nathan Radley seals up the knothole in the oak tree. He does this to stop Boo Radley from leaving gifts for Scout and Jem, as he wants to keep his brother isolated and prevent the children from interacting with him. This act symbolizes Nathan's desire to maintain control over Boo's life and further emphasizes the theme of isolation in the novel.
Nathan Radley knows Boo has been leaving gifts there for the children so fills the hole in with cement. When the children enquire as to why he's doing this, he lies and says that the tree was dying and this would save it.
In "To Kill a Mockingbird," Jem discovers that someone has left gifts for him and Scout in the knothole of the tree by Boo Radley's house. When Nathan Radley fills the knothole with cement, Jem is heartbroken because he realizes that Boo Radley was the one leaving them gifts, indicating that he has been watching over them and cares for them.
zeebo
She dressed up as a ham
The children find small gifts in the knothole of the tree, including two carved soap figures that resemble them, a pack of gum, and shiny pennies. These gifts are left by Boo Radley, who is trying to reach out to the children in a secretive way.
Mr. Radley filled the knothole up with cement.
The black community.
We can't do your homework for you.
Her shoes