I am the Gardener Hero, summoned from another world!

Using magic, you've been summoned to a new world! You're a hero who must save the kingdom from a demon lord! But it turns out it's not that simple, because you don't have any heroic abilities! Except for one thing... You're a gardener... But you can't grow fruits and vegetables... But..., but you can bring heads to life and grow them in a flowerpot! Pretty cool, right???