Domain: society (Horticulture and Plant Care)
Problem: I have had this plant for only three weeks and its current condition is worrying me. I am located in Northern Germany where it is currently winter, so I have tried to provide an ideal environment including a room temperature of 21°C and humidity around 50%. I even misted it recently for extra moisture. Since natural light is scarce during winter, I added a grow light but kept it at the lowest setting for six hours a day to avoid leaf burn. However, as shown in the photo, the bottom leaf is turning yellow and wilting. Given that I have managed both light and humidity, is this a nutrient deficiency? Should I apply fertilizer immediately to supplement its nutrition?
Answer: Do not fertilize. The yellow leaf is caused by insufficient light energy. Significantly increase the brightness and duration of the grow light (Suggest 10-12 hours).