In a letter, Tolkien wrote that Radagast gave up his mission as a Wizard by becoming too obsessed with animals and plants, but stated that he did not believe that Radagast's failure was as great as Saruman's. Christopher Tolkien commented that Radagast might not have failed completely, as he was specifically chosen by the Vala Yavanna for a mission to protect the plants and animals.
In a letter Tolkien wrote that Radagast gave up his mission as a Wizard by becoming too obsessed with animals and plants but stated that he did not believe that Radagast's failure was as great as Saruman's Christopher Tolkien commented that Radagast might not have failed completely as he was specifically chosen by the Vala Yavanna for a mission to protect the plants and animals