baobab leavs going brown why?

[Alex87]

hi this is my first post on this forum (hopfully first of many) and I have a question about my baobab tree which I grew from seed. The leavs are starting to go brown like the colour is being drained from them. dunno if this is a common problem or there is sumthing wrong with the soil/too much sun or sumthin.

any help would be appreciated

thanks
-Alex[/img]