What are the growth habits of Fritillaria thunbergii?

Fritillaria thunbergii prefers humid and cool climatic conditions. During the growing period it requires moist soil and is intolerant of drought, but it fears waterlogging.

The suitable soil temperature for seedling emergence is 6°C to 7°C, and the optimum air temperature for plant growth is 10°C to 22°C. Growth stops below 4°C or above 30°C.

The bulbs sit 5 cm underground. They can expand normally when the average daily soil temperature is 10°C to 25°C, enter dormancy above 25°C, and the bulbs are damaged by freezing below -6°C. Both the bulbs and seeds of Fritillaria thunbergii have a dormant phase. The bulbs enter dormancy starting from the withering of the aboveground parts, and dormancy is broken after natural overwintering through the summer until September. Seeds can also have their dormancy broken after about 2 months at 5-10°C or through natural overwintering. Therefore, autumn sowing is mostly used in production.

The suitable air temperature for flowering is around 22°C, and it prefers ample sunlight.

In Fritillaria thunbergii, bud differentiation has already begun while the bulb is in a dormant state, accelerates in September, and is basically complete by mid-November. In late November the main bud sprouts and protrudes from the surface of the mother bulb. In the Jiangsu and Zhejiang area, the young buds emerge in mid to late February; in Henan Province, from late February to early March; in Beijing, in mid to late March. After about 1 month of growth, the Fritillaria thunbergii plant shows buds at the top, and the flowers open gradually from the bottom upward, with the flowering period lasting 10 to 20 days. After the plant shows flowers, new bulbs begin to appear underground, and the mother bulb gradually rots away. The time when the aboveground parts wither is roughly the same everywhere, all in mid to late May, when the underground bulbs enter the dormant period.