In "The treasure of Lemon brown" how lemon is In the beggining?

Hello

"The Treasure of Lemon Brown" by Walter Dean Myers is a story about Greg Ridley, who starts off having a bad day. Doing poorly at school, he is positive his dad is going to tell him he can’t play basketball for the team with whom he’s been dreaming of playing. Two nights after Mr. Ridley banishes Greg to his room to study, Greg decides to leave the house and just get away. He goes to an abandoned warehouse, where he meets Lemon Brown. Through his interactions with Lemon, Greg begins to reflect on his life.