They only require soil, sun, water and very little nutrients. I only amend the soil with compost and worm castings. If a plant isn’t growing well or the color looks anemic, I will give a little fish emulsion. Most do not require a lot of water. If they look thirsty during a dry spell, I give them a long drink of water. With the herbs I grow, the exception is basil, parsley and cilantro which do better with a good soaking once a week. Pinching the tops out of plants like basil and cilantro will make them bushier and prevent them from going to seed. Herbs are most favorable and fragrant if cut just before blooming.