Answer:
Light hides me and darkness kills me. What am I?
Glittering points that downward thrust. Sparkling spears that never rust. What am I?
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
I am used when you jump off a bridge for fun.
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
It produces a flower but it is not its fruitΝΎ it produces branches which are its fruit.