Using Hydrogen Peroxide (H2O2) with plumeria
Hydrogen Peroxide can be very beneficial in plumeria growing, especially with seeds and seedlings. I have been using it now for quite a number of years for all the seeds plus seedlings I grow and it does help me a lot provided it is mixed in the correct ratios.
For general work you need to use a 3% solution of H2O2 which is the most common one and is usually available readily in pharmacies or in bulk from different retailers, I was buying it in 20 litre drums from a bulk cleaning supply firm.
For seeds : I use a mix of 100 ml(3ozs) to 1 ltr(1 quart/.25 gal). For seeds planted in a mix I use a bottle with holes in the lid but for those in paper towel I use a spray bottle. This mix will kill off the fungal bacteria that can cause problems with seeds as they germinate. This ratio can also be used when watering seedlings before they are big enough to move, I add the same ratio to water when I am watering them in after moving them into pots but I also have either vitamin B1/seaweed solution(seasol liquid, powdered seaweed etc) or both these already mixed into the water to help de-stress the seedlings, the H2O2 kills off the fungal bacteria and aerates the new mix.
Seedlings : Mix is 150 ml(5 ozs) to 500ml/.5ltr(1 pint/.5 quart). If your seedlings have either been over watered or are outside in the rain and the mix they are in is very wet this solution will flush out the water and aerate it so that the seedlings can take up oxygen from the mix and not have the roots “drown” causing the seedlings to die. It also kills off the fungal bacteria that can start up from all the moisture.
Although I have never tried it I have been advised that a 6% H2O2 solution mixed with water can have an effect an a couple of fungal diseases on plumeria as well, I hope to check this out in the future and will let everyone know my findings.
The above are proven to work, the ratios can be adjusted slightly to suit what you are doing with it, I often will drop the amounts of H2O2 or raise them slightly but these are the average ratios that work best for me.