I've heard a lot about h202 as well. If you're running all organic, I'd say you're sol unless a tobacco or some strong insecticide is deemed effective. If chemical ferts mix 1 part store bought (3%) h202 with 3 parts water. you can mix with regular chem ferts without worry. When the soil is leached it will bubble a little bit but it should be lighting those aphids up. reapply h202 in lower concentrations, (maybe drop back to 1 part h202 9 parts water) when you feed. H202's only downside is killing all organic material.