The Gardener series blades are beveled and sharpened on one side only, the other side is a full flat. The reason for this is a particular way of cutting.
In the video, the girl explains that a flower's stem should be cut at an angle in order to not crush the veins, and demonstrates how.
She shows that cutting towards yourself makes for a cleaner cut than cutting away from your body.
The cleanest cut will be made with a single bevel blade, but most people haven't got one. Please note that the Vics in the pics are intended for right hand use.
https://www.youtube.com/watch?v=9xrkU1hBGuY