Introduction:
In the story "The Gardener" by Rudyard Kipling, the character Derry goes to Mr. Lamb at the end because of his wish to live a free life. This answer will explain the reasons behind Derry's decision and how it relates to his desire for freedom.

Explanation:
1. Desire for Freedom: Derry has always dreamt of living a free life, away from the restrictions and rules of his boarding school. He yearns for a life where he can roam freely and be in touch with nature.

2. Connection with Mr. Lamb: Throughout the story, Derry forms a special bond with Mr. Lamb, the gardener. Mr. Lamb not only teaches Derry about gardening but also understands his longing for freedom.

3. Symbolism of the Garden: The garden represents a place of escape and freedom for Derry. It is a space where he can be himself and experience the beauty of nature. Derry is drawn to the garden as it aligns with his desire for a free life.

4. Rejection of Boarding School Life: Derry's decision to go to Mr. Lamb at the end signifies his rejection of the boarding school life that restricts his freedom. He realizes that he cannot be truly happy in the confines of the school and seeks a life where he can explore his passions.

5. Mr. Lamb's Influence: Mr. Lamb's encouragement and understanding further strengthen Derry's resolve to pursue his dreams of living a free life. Mr. Lamb's own love for the garden and his desire to live a simple life inspire Derry to make the decision to leave the boarding school.

6. Leaving the Boarding School: By going to Mr. Lamb, Derry takes a bold step towards his freedom. He chooses to leave behind the structured and regulated environment of the boarding school in favor of a life that allows him to explore his individuality and pursue his passions.

Conclusion:
Derry's decision to go to Mr. Lamb at the end of the story is driven by his desire to live a free life. He rejects the confines of the boarding school and seeks a life where he can be true to himself and experience the joys of nature. Mr. Lamb's influence and the symbolism of the garden play a crucial role in shaping Derry's decision.