You can achieve control of the elements themselves.
Summoning gentle rains or raging storms.
Mastering things like fire, water, air, earth kinesis,
(Basically all the stereotypical wizard stuff)
Then there are Nature Spirits / God’s themselves who are some of the most powerful & loyal allies, and their abilities are as diverse as the plant kingdom.
Talking to animals is something that can happen as well.
(Telepathic communication with nature as a whole)
Deep connection to nature and the cosmos will help with the accumulation of life force energy.
(Imparting a longer life span)
(And stronger magic)
You can become so connected that don’t get lost and can sense earthquakes. (can happen with lots of training)
Immortality is also something that can be achieved.
I mean these are just scratching the surface, what’s possible could fill a very large bookshelf if not a library.