Baking soda, dish soap, and water. Add 1 tablespoon of baking soda, 1 teaspoon of dish soap and 4 cups of water. Mix and pour in a spray bottle. Mist it on the stem, soil, the top, and underside of the leaves.
Just did it last night and it got rid of some bugs on my flowers. Have to reapply. Will do it to my weed plants too.