You can see in the dark

You have a perfect sense of direction, you always know the way even through the largest forest.

You can enhance or hinder plant growth, and even control type of growth.

So in the winter you can help the roots reach down further and anchor plants to help prevent mudslides, and strengthen branches to help prevent them from breaking under the weight of snow and ice. You can encourage blossoms in the spring and fruit growth in the fall and foliage growth whenever the plant requires it.
You can also look at a plant overburdened by fruit and inhibit it so that its strength can keep up with its ambitions...

And you always always always win the rose contests. :)

The staff is a magical artefact to begin with.
Then you also have the power to breathe underwater, and you can swim at a very high speed. You got superhuman strenghth and you can see things differently underwater

You make people smile. It is a deadly power because they can never stop smiling until you release your spell.

You can talk to dragons, even when they're far away

You can make people fall in and out of love with nary more than the snap of your fingers!

You can make people forget you with a glance

you can communicate with animals

you can create illusions and teleport