Reason: one of the most likely reasons is that the temperature is too high, which causes the plant to grow too fast. It's no surprise that such a long period of time will lead to such a situation.
Solution: if that's the reason, of course, you have to adjust the temperature properly. The temperature range varies over time, and a distinction between day and night is needed. For the daytime, the temperature is better between 10 and 15 degrees, but more than 20 degrees, otherwise it is likely to cause a long time. As for the night, the temperature range is best from 8 to 10 degrees.
Reason: if it is the Narcissus raised at home, there is a common problem, that is, too little light. However, there is nothing but this reason. If the indoor temperature is high, and the temperature difference between day and night is not very big, then it is easy to lead to the phenomenon of vapid growth.
Solution: the temperature measures have been mentioned above, so here we only talk about the light. When it's sunny and windless, we can move the plants outside at noon and find a sunny place. In this way, we can effectively suppress the phenomenon of excessive length
Reason: if we don't often change water when we plant, it will also cause the phenomenon that troubles us.
Solution: if this is the case, then we have to change the water regularly. You can pour out the water every night, and then change into new water the next morning.