Macon Mixx' special talent is finding magical plants. He can cast spells to locate known magical plants and can instinctively tell if an unknown plant has magical potential. His talent also gives him some intuitive ability to use magical plants appropriately, but this facet of his ability doesn't always work as well as one could hope. His cutie mark is a mortar and pestle, and he works as a pony apothecary, creating potions both medicinal and magical from the specimens he collects.
Macon Mixx may be a unicorn, but his magic tends to be passive rather than active. As for the showy, horn-lights-up-and-stuff-happens type of magic, let's just say that Macon is best leaving that to somepony else. His track record includes two fires, three broken bones, and several nights in jail for being a public menace. But as long has he sticks to what he is good at, Macon is a great colt to have around.