The granted power is the same as the PHB.
1st - Detect Plants (replaces Entangle)
2nd - Speak with Plants (replaces Barkskin)
3rd - Plant Growth
4th - Command Plants
5th - Transport via Plants (replaces Wall of Thorns)
6th - Plant Body (replaces Repel Wood)
7th - Animate Plants
8th - Control Plants
9th - Shambler
Thoughts?