The temperature requirement of Viola tricolor is not high during its growing period. The best temperature is 15-25 ℃ in the daytime. If the temperature is relatively high in the daytime, or kept at 30 ℃ continuously, it is not good for its flowering. If the seeds are planted for reproduction, it is best to keep the temperature at about 15-20 ℃, which is more conducive to seed germination. If the temperature is low, its seeds will not germinate and will affect the later growth.
