The carefree flower does not have strong cold resistance. The temperature of about 5 ℃ may freeze it, and the temperature of 13 ℃ will stop it growing, which is why this plant is rarely seen outside in the north. It can stand the high temperature in summer and likes to grow in warmer environment. During the seedling period, it can be placed in a semi shaded place for maintenance, and other times it can be moved to a sunny place.
The seeds of carefree flower are large, and each seed weighs about 6.8g on average. And the seeds should not be stored for too long, only 3 months can make the seeds invalid. Therefore, the mature seeds can be sown in late August after being picked in August every day. But if you want the seeds to germinate quickly, you need to keep the temperature above 18 ℃ and keep a certain humidity at the same time, so that you can send out small sprouts in late September, and all of them will germinate in October. It is not until March next year that the seedlings can be moved and transplanted. But in the meantime, we must take good measures to keep out the cold, and don't let the sprouts just come out freeze to death in winter. Spring and summer are the most vigorous period of its growth, and its diseases and insect pests are very few, these two seasons need to be fertilized once a month, but to stop fertilizing in autumn, so it is very helpful for the seedlings to winter.
