Starlight examined the 'assignment' Twilight had just given her. "It's a… pot of dirt?"
"Not just dirt," Twilight explained. "There's a seed inside!"
"Ah, that makes more sense!"
"Which brings me to your assignment, Starlight: I want you to take that seed and grow it into a—"
"Got it!"
"Huh? Starlight, I wasn't fini—"
Not letting Twilight finish — after all, if she already knew what to do, then why wait? — Starlight immediately cast the requisite spell. On cue, the dirt rumbled; moments later, a colossal mass of leaf-covered branches shot out of it, quickly growing towards the ceiling. Once the dust had settled, the gargantuan philodendron may as well have been a Hearth's Warming tree.
"Ta-da!" Starlight singsonged, eyes closed and smile wide in prideful satisfaction... That is, until she felt the daggers Twilight was staring into her. "Wait, shoot. There was going to be a catch, wasn't there?"
"Yes," Twilight deadpanned. "Yes there was."
"And that catch was…?"
"'Grow the seed into a plant… without using magic.'"
"Ah. That, uh, makes more sense."