I am not a big fan of Aphids....so I use this to control them on my herb plants.
1/2 cup Parsley flakes (fresh is best)
2 Tbsp. of minced garlic
3 cups water
Mix together and boil to 2 cups. Strain and cool.
I use this in a 20 gallon hose-end sprayer drench the herbs....use until aphids are gone. Could take a few days.