i think giving it realistic physics would take away from its current charm.
the motion of this has its own character, which adds depth to the animation.
The swift burst suggests action, easily understood that something happened.
Having it adhere to either an upwards or downward slice of a sword is detail which isn't necessary to the intent.
critique:
The end of the anim is slow, as if it is caught by the resistance of air(which is good).
You could take the pieces of the flower and split them into their own separate anims which could be spawned as particles within the actual game. in this way, you could have unlimited variances of the action.
also, the bud of the planet would probably be heavier than the peddles, and so it should fall quicker than them.