Jio and Ougon and the Forbidden Magic(2009)

Jio to Ougon to Kinjirareta Mahou

Jio is a young magic user whose goal is to one day become the greatest magic user in the world! He lives a sheltered life with his master Iregaura, until the events of one day leave him to journey out into the world alone. Jio, whose magical specialty is making flowers bloom, has a lot to learn about the world outside his home, but he is still determined to achieve his goal!

(Source: Mangahelpers)