In addition to macronutrients, Viper's bugloss also needs several micronutrients, albeit in smaller quantities. These include iron, manganese, zinc, copper, and boron. Micronutrients play roles in photosynthesis, enzyme function, and overall plant development. If your soil is deficient in any of these elements, consider using a micronutrient-rich fertilizer or foliar spray to provide an instant nutrient boost.