A few days later, the bud withered again. What is the reason?

1. Bulbs are of poor quality, such as small bulbs or diseases and insect pests, dry root discs and few roots.

2. Poor hydroponics, unclean water quality, poor water exchange, insufficient light, high room temperature and poor ventilation.

3. If the season of hydroponics is wrong, such as the bulb dormancy period before the first frost or hydroponics when the temperature rises after Qingming, it is difficult to bloom.