It was easy to imagine Mo's little blackthorn seed growing up into a sturdy, solid tree - the professor's had done it and some of his classmates were already successful. Mo pointed his wand at the potted seed, now buried deep in the dirt, and tried to give SERIOUS intent to the spell. He intended for it to grow up to be a tree. He intended for it to be the biggest and best tree in the class.

Mo was solid at intent.

He narrowed his eyes at the pot and gave his wand two practice flicks before he finally flicked and spoke at the same time. "Herbivicus." Almost as soon as he finished speaking a green shoot sprouted from the dirt, which was thickening even as it grew, until a short tree stood there. Not short for much longer, based on how fast it was growing up before his eyes.