Talk:Circle of Plants (5e Subclass)
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I would change the sub-variants of this subclass to something more flavorful than Offense and Defense. Possibly Oaken Defense and Vines' Offense
Powerful Spells is quite specific and niche.
Advanced Shaping favors defense and is OP. A full caster at 6th level would only be able to polymorph themselves into a CR 6 or below beast. This druid is able to turn themselves into a CR 9 Plant(CR 9 is above the max CR for beasts anyway, T-Rex being CR 8). Plus, they retain their mental ability scores, which far outweighs polymorph. Consider swapping the 6th and 10th level abilities.