What is the flowering mechanism of ratoon flowers?

Perennial flowers, as the name suggests, are flowers whose underground parts can survive the winter in the soil, and the above-ground parts can germinate, grow, bloom and produce seeds the following spring. The advantage of this type of flower is that it is easy to propagate and manage. It can bloom for many years after being planted in one year. It is an extremely suitable plant material for urban greening and beautification. The underground part of the plant survives the winter without forming hypertrophied spherical or lumpy roots. It can still sprout and bloom flowers that last for many years the following spring. The following introduces the flowering mechanism of perennial flowers:
Photoperiod: Perennial flowers often need photoperiod to stimulate flowering. Long-day plants require hours or longer days to bloom, while medium-day plants bloom regardless of day length. Short-day plants require short days (generally less than to hours) to bloom. Long-day plants can be stimulated to bloom during their non-natural flowering season by artificial light. A simple and easy method is to supplement light at night and supplement hourly light from night time to early morning the next day. Incandescent light with an illumination level of up to lux is sufficient. Fill light can sometimes cause excessive growth, especially when using incandescent light. So turn off the light as soon as buds appear.
Vernalization: There are three key elements for successful vernalization, none of which are indispensable:
Plants ready for vernalization must be fully mature
Appropriate low temperature (generally not higher than)
Appropriate low temperature treatment time (generally at least to weeks). The effect of immature perennial flowers after low-temperature treatment is not ideal. Generally, at least a month of vegetative growth period is guaranteed before low-temperature treatment. Vernalization can significantly shorten the flowering time and uniform flowering period after transplantation.