Nocturnal fragrance likes warm, humid and sunny environment; it requires fertile and sticky soil, and sandy soil is not suitable for growth; it is forbidden to accumulate water and dry.
There is no dormancy period in the tropics. It can bloom all the year round. In other areas, the leaves are dormant in winter.
It is native to South America. It is an evergreen herb in its origin. If the temperature is suitable, it will grow all the year round. It blooms all the year round, but it is the most abundant in summer. When it is cultivated in open field in China, it can only be planted in spring because of the severe cold in winter in most areas. Germination growth in spring, flowering in summer and autumn, dormancy in winter (forced dormancy).
Because the pistil is later than the stamen, the natural seed setting rate is very low.
The suitable temperature for the growth of nocturnal is 20 ℃ - 30 ℃. Flower bud differentiation takes place in late spring and early summer, and the minimum temperature is about 20 ℃. Flowering or not is also related to the nutritional status of the sphere. Generally, if the sphere mass is more than 11g, it can bloom in the same year; otherwise, it will not bloom in the same year.
The clay loam is suitable for the loose requirement of soil quality; it is sensitive to soil moisture and likes the fertile, moist soil without water accumulation. In drought, the edge of the leaf is curled up, and the flower bud is shrunk, so it is difficult to open.
[evening primrose]
