Seed germination
Nathan Lange (Tue, 13 Jan 2015 17:17:03 PST)

Rooting powder should never be used on seeds. With regard to
germination, auxins (active ingredient in rooting powder) are usually
associated with the inhibition of seed germination. While there
always seems to be exceptions in the literature with regard to plant
phytohormones, I can't think of one in this case. The only
conceivable situation where a benefit of rooting powder on seed
gemination might be noticed is when using very old rooting powder
containing a fungicide and the auxin has already oxidized, rendering
it biologically inactive. I guess the fungicide in the rooting
powder (if there is one) could be of some help in this case assuming
it didn't also inhibit germination, but I wouldn't waste the time or
resources to find out.

With regard to using hydrogen peroxide on seeds, I recommend doing
your homework first (google it). While 3% may work great with many
species, this concentration can also kill seeds of other
species. Besides being beneficial to seed germination as a
fungicide, hydrogen peroxide also improves seed germination by
physiologically altering the dormancy states of seeds of many
species. One practical example is its use to improve the germination
rates of old seeds of some species. There is probably a lot of
literature on these topics available online.

Nathan