From this photo, I can’t really tell what the plant used to be but you definitely did some damage. For starters, you should always make sure if you are going to spray a plant for anything, it should be watered at least 12 hours before spraying. In the picture I can see that the plants aren’t getting enough air circulation, important to reduce the chances of disease and insects. I never ever recommend home concoctions since their efficacy can vary widely. You didn’t specify what oil you used, if it was a vegetable or hort oil. If you used a vegetable oil, you have effectively smothered the plant.(s) stomata which helps respiration. In homemade concoctions, the only two detergents ever recommended are Ivory soap and Dawn dish detergent. Others contain ingredients such as orange or lemon oil which is fine for dishes, not so much for plants. About the only thing I can I can suggest now is to cut back the plants hard and see if you get some new growth at the base.. You should separate them and place them in a cooler, brighter area. Plants don’t need to be as warm as you and it helps reduce insect problems. Do not fertilize as that will produce soft green growth, perfect for aphids. Bringing herbs indoors does invite problems so you have to be careful when doing so. Since aphids prefer new growth, you should check at least once a week for an infestation. In the future, use a product registered for using on herbs indoors and not a homemade concoction.
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