Sorry I typed soak and was trying to not spell saturate. If your daylily is well watered it will absorb less of anything you put on it and the baking soda and soap is an external treatment or a topical treatment. So after watering, you can dip a paper towel in the mixture and wipe the leaves if you see signs of the aphids still on the daylily. Then pour about 2 quarts all over the daylily trying to get both sides of the leaves. I just talk to my daylilies and tell them they are getting a bath.
