[@uliop]
Kinetic Energy controls movement and hindrances, however you could restrain people with other elements too, though Ice would probably be easiest. This is where the Effect part comes into play. It's based on intentions of the caster. Controlling roots is out of the question. Maybe if you were to stretch it and say you control the water in plants but the amount of energy required would be immense.

As for creation magic, to a degree though it would be more efficient to enchant an existing weapon. All magic causes a drain. Elementals cannot be created. To create life with magic, you'd probably lose your own. Magic is not free thinking nor is it alive. It is simply force through elements.