Plant Shape III
School transmutation (polymorph); Level sorcerer/wizard 7
This spell functions as plant shape II except that it also allows you to assume the form of a Huge creature of the plant type. If the form you assume has any of the following abilities, you gain the listed ability: DR, regeneration 5, and trample.
Huge plant: If the form you take is that of a Huge plant, you gain a +8 size bonus to your Strength, a –2 penalty to your Dexterity, a +4 size bonus to your Constitution, and a +6 natural armor bonus.