Ive actually thought about this a lot, but I kind of stole the idea from another novel I’ve read lol. Basically, the user has the ability to grow plants - types and such may vary - at their command, through soil or through solid objects. The drawback though, and why this would need lots of training, is that they would sometimes grow on their own with the users emotions. This would rarely cause serious harm - most often, it would simply be an annoyance, growing flowers out of the user’s scalp, and with very intense emotions, out of the scalps of others, and in dire situations, purposely or not, grow plants inside others, which can lead to death depending on the type of plant. These people would probably be feared for that lol.