pure oxygen is dangerous shit m8 - as in it like oxidises stuff - u know = burns things / makes metal go rusty etc........
More likely to make ur plants spontaneously combust rather than makin them grow
Hydrogen is also very explosive. Even more when mixed with pure oxygen.
I can imagine u lighting up a spliff & taking the roof off of ur house!!
*don't bother tbh - just see what others have got good results with & do the same - before u leave a crater where u used to live