Yes, Mr. Radley indeed blocked the hole. He wanted the children and Boo radley to stop the communication.
Mr. Radley filled the knothole up with cement.
They can not because the knothole is filled with cement by Mr. Radley
Mr. Radley puts cement in the knothole to prevent any further communication or interaction between Boo Radley and the children. This action is driven by his desire to isolate Boo Radley from the outside world.
Nathan Radley, Boo Radley's brother, tells Jem that he cemented the knothole because the tree in the yard is dying. This information delivers a blow to Jem and Scout, who have been cherishing the gifts left in the knothole by Boo Radley.
It happens in chapter 7. That's when Mr. Nathan Radley puts cement in the knothole.Mustache! :{)AHA
The person who closes up the knothole in "To Kill a Mockingbird" is Nathan Radley, Boo Radley's older brother. He fills it with cement to prevent communication between the kids and Boo, as he believes it is leading to trouble.
Mr. Radley cut off Boo's only link to the outside world by sealing the knothole in the tree with cement. Boo Finch used to communicate with Jem and Scout by leaving small gifts and trinkets in the knothole.
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.
Boo Radley leaves gifts for the children in the knothole of the tree.
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," 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.
Boo Radley