While herbs are generally easy to grow, they may encounter common issues such as pests, diseases, and nutrient deficiencies. Some common pests that affect herbs include aphids, spider mites, and whiteflies. Diseases like powdery mildew and downy mildew can impact certain herbs. Nutrient deficiencies can manifest as yellowing leaves or stunted growth. Identifying these problems and taking appropriate measures, such as using organic pest control methods or adjusting soil nutrient levels, can help resolve these issues and ensure healthy herb growth.