Right now I'ma seventeen year old male who is 5'8". What can I do to increase my vertical growth?

not a hell of a lot

Well said.

Way easier to stunt than to increase growth...

Good posture is really the only thing you can do...

You could stretch yourself.

why thankyou

This is good advice, I know as I look a lot taller when I stand up straight as opposed to when I slouch over. I just have to remember to stand tall all of the time.

Anyway, I was wondering if there's anything I can in the way of diet. Any idea?

Eat MiracleGro.