If your purple root orchid is just planted, you don't need to be so nervous about its yellow leaves, because it's a normal phenomenon, and you don't need to pay much attention to it. Usually, within one week of planting it, its leaves may turn yellow, which means that it is slowing down the seedlings, so it is a very normal phenomenon. After that time, its leaves will soon return to green. But if you are really worried about it, you can cut off the yellow leaves. After about a month, it will start to grow crazily.
If you put too much fertilizer on it at ordinary times, it will be easy to make it yellow, which is what we often call fertilizer damage. Because too much fertilizer will make it too nutritious, so its roots can not be absorbed all at once, so it will burn the roots. So we need to pour some water on it to dilute it, and pay attention to control the amount of fertilizer in the future. In addition, we should not allow too little fertilization, or we will lose nutrients, which will also affect the leaves.
When watering it, be sure to control it, because too much water will make the leaves yellow. Generally, when you water it again, you should not water it when the pot soil is not dry. When it is dry, you should water it again. As long as you make the pot soil moist properly, you can't make the water too much or too little. In this way, you can make its leaves grow well and have luster all the time.
People who have raised it all know that it is a cool and humid place. In such an environment, its leaves rarely have problems. But if it is in summer, the temperature will be very high, and the air will be relatively dry, so the leaves will turn yellow. At this time, we should not worry too much, as long as it is in autumn, this phenomenon will be gone.
