Ans. These are some symptoms of malnutrition in orchids that you should watch out for: ● When there is a lack of nitrogen, your plant will get stunted. As a result, there will be a limited number of buds. Also, the leaves will turn yellow. ● When there is a lack of potassium, your orchid plants will be underdeveloped. As a result, they will be vulnerable to diseases and pests. In addition, the seed germination will be poor. ● When there is a lack of phosphate, your orchid plants will be short with underdeveloped roots. As a result, they will bloom slowly, young shoots will not grow, and there will be less fruiting. ●  The lack of calcium will result in underdeveloped roots, weak plants, and small leaves that will fall quickly. ● The lack of sulfur will make your plants barren. Your plants will become sick. And young leaves will turn yellow. ●  Magnesium deficiency will make the roots large but the leaves small. As there will be a lack of chlorophyll, the old leaves will turn silvery-white.