Just happened upon this substance last seen in school science a long time ago. Looks like it might be a (longer acting) alternative to H2O2.  Anyone tried this?

 

Rich, its a strong oxidizer and might react with the living plant tissue causing injury.  Obviously, thats why its used as a disinfectant, but dose and exposure would be very important.  I would think it would be better as a seed treatment, but its just a guess.  

I use this as a parasite treatment in my Koi pond. It will burn living tissue if too strong. It also stains easily. Getting the right dosage is key.

I have only ever used it as a quick dip diluted solution treatment  for fish.  It is very powerful and caustic.

yes, to strong an oxidizer for most living things as would be 30% hydrogen peroxide, which is diluted to 3% typically.  There is another side effect of treatment, possibly unhealthy levels of manganese left behind as manganese makes up about 45% of the weight in potassium permanganate, KMnO4.  Hydrogen peroxide leaves water so it leaves nothing that would tip the soil chemistry balance.  Adding fertilizer with manganese and then permanganate would seem to be more difficult to maintain proper nutrient levels.

Thanks Guys, sounds like it would work but risks side effects even when highly diluted. I will steer clear.