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???​