Talk about the reason why cordate telosma and epiphyllum both bloom at night.

Epiphyllum, alias Qionghua, is a beauty under the moon, belonging to cactus and epiphyllum. Scientists often use "a flash in the pan" to describe things that appear quickly and disappear in an instant. Why use a short metaphor? Because epiphyllum is big and beautiful, it doesn't bloom during the day and doesn't bloom until after eight or nine in the evening. It usually blooms for 3-4 hours and fades soon after flowering, so it is called "a flash in the pan". As for why epiphyllum only blooms for a few hours at night, it is generally believed that it should be understood from the climatic conditions of its origin. Epiphyllum is native to the Mexican desert in tropical America, where the climate is dry and hot. After long-term adaptation to natural conditions, Epiphyllum has been trained not to be afraid of drought. The leaves of epiphyllum degenerated into small needles to reduce water transpiration. During the day, the temperature is high, the water evaporation is large, and there is not enough water to bloom. At night, when the temperature is low and the evaporation is small, you can get enough water to bloom. It will wither 3-4 hours after flowering, because the petals are all open when flowering, and it is easy to lose water. However, the water absorbed by roots from sandy soil is limited, which can not maintain the water needed for petal cell pressure for a long time. In the case of insufficient water, flowers will close and petals will wither quickly. On the other hand, in the Mexican desert, the temperature difference between day and night is large, and epiphyllum will bloom after 8 or 9 pm, which may also be related to the local temperature. It blooms for 3-4 hours at 8: 00 at night, which is most beneficial to it to avoid high and low temperature climate. The genetic characteristics of Epiphyllum in the process of long-term natural selection have been preserved now. People and animals should sleep. Interestingly, some plants also want to sleep. Sunflower is a sleepy little guy. It just wakes up at 10 in the morning and blooms colorful flowers, but after noon, its flowers are closed and go to sleep. On a cloudy day, it seems to be very playful and will not enter the "dream" until evening. Some flowers sleep during the day and wake up at night, and the circadian rhythm is reversed. For example, Mirabilis jalapa blooms around 5 pm, and at dawn the next day, the flowers close and start to sleep, as if afraid of seeing the sun. There are many smiling flowers in the moonlight, such as moonlight flower, cordate telosma, cordate telosma and so on. , are closed during the day and open at night. Even more interesting is saffron, which blooms in early spring. During the day, they sometimes turn on and off, wake up and sleep, sleep and wake up-several times a day! Why do plants sleep? It turns out that the sleep of plants is an exercise for them to adapt to the surrounding environment and protect themselves. During the day and night, there are obvious differences between light and dark, high and low temperatures and different air humidity. Plants gradually form their own sleeping habits in the process of long-term natural selection. There are also flowers that bloom during the day and close at night, such as water lilies and tulips. Why is this? The phenomenon that flowers bloom during the day and close at night is the sleep movement of plants. This movement is caused by temperature change, and it is closed at night when the temperature is low. If the closed flowers are moved to a warm place, they will reopen in 3-5 minutes. The other is caused by the change of light intensity, such as flowers opening in strong light and closing in weak light. [Morphological characteristics 1 perennial evergreen succulents. The metamorphosis technique is oval strip, thick and fleshy, with wavy edges, lignified middle ribs and waxy and shiny surface. Flowers solitary on the edge of deformed branches, pedicellate, large, double, white, petals lanceolate; Calyx is red and tubular. The flowering period is from July to August, and it usually blooms around 10 at night. The fragrance is overflowing and begins to fade after 4 hours. (See Figure 1-5) [Habitual] It is native to Mexico and Guatemala and is now widely cultivated in various places. Sexual preference for warm, humid and semi-shaded environments; Not cold-resistant, more drought-resistant, avoid strong light, and have higher requirements for temperature; It grows well on sandy loam with good drainage, good ventilation and rich humus. [Cultivation techniques] Propagation: Cutting propagation is adopted. Silver liver can be cut in high temperature greenhouse all year round, but the survival rate is the highest in the greenhouse shade shed in early May. When cutting with flaky branches, it is best to cut biennial branches (tender branches are perishable), or cut them into 2-3 sections with stick branches, flatten the base and insert them into clean plain sand. The soil moisture content is about 60%, and it can take root in about 1 month. When the roots grow to 3-4 cm, they should be put into the pot. Management: big pot planting. Adequate water supply should be provided during the growing season, especially after budding; When the air is dry, water should be sprayed on plants in the morning and evening. From spring to flowering, apply dilute "alum fertilizer water" for 3-4 times. Cultivation places should be protected from light. Excessive shading and excessive application of nitrogen fertilizer will make plants grow in vain, not flowering or rarely flowering. But the sun is too strong and the air is too dry, which will make the leafy branches turn yellow and shrink. After the buds are formed, the plants should move less to avoid strong winds. Plants have a short dormancy period after flowering, so watering should be controlled, and fertilization should be applied several times in autumn after dormancy period to cultivate trees. Overwintering indoors, keeping the basin soil properly dry, and keeping the room temperature above lOq2. Lower temperature (such as 0-5 ~ C) may not freeze to death, but it will affect the flowering of the next year. Generally, the pots are not changed in the same year, and must be changed in early autumn or early spring. Epiphyllum has the habit of flowering at night, so it should be changed to "day and night upside down", that is, when the bud expands, it should be moved to a dark room or strictly shaded during the day without any light. Irradiate with 100 watt bulb at night for about 10 hour, and it will bloom in the daytime after 7- 10 days, and the flowering time can be extended for several hours. The leaves and branches of epiphyllum are green and quite natural; Flowers grow up, pure and fragrant. Flowers bloom only tonight, but tomorrow is hard to see, so it is called "a flash in the pan". Why does cordate telosma smell good at night? Most of our common plants bloom during the day and give off fragrance after flowering. Cordate telosma is not the case. Only at night will it give off a strong fragrance. Why is this? This strange temper of cordate telosma took several generations to form. Many plants rely on insect pollination to reproduce their offspring. A plant that pollinates by insects that move during the day. During the day, flowers are fragrant and welcome messengers. Cordate telosma is pollinated by moths that appear at night. In the dark, with its strong fragrance, it lures winged "guests" to visit and delivers pollen to them. This habit of cordate telosma is an adaptation to the environment. The petals of cordate telosma are different from those that bloom during the day. The pores on the petals of cordate telosma have one characteristic. Once the humidity of the air is high, it will expand, the pores will expand, and more aromatic oil will evaporate. Although there is no sun at night, the air is much wetter than during the day, so the pores are wide and the aroma is particularly strong. If you pay attention, you will find that the flowers of cordate telosma are more fragrant than sunny days, not only at night, but also in rainy days, because the air humidity is high in rainy days. The hometown of cordate telosma is in tropical Asia. During the day, the temperature is high, and flying insects rarely come out. The temperature drops in the evening and at night, and many flying insects come out to feed. At this time, cordate telosma exudes a strong fragrance, attracting flying insects to spread pollen. After generations of environmental factors, cordate telosma has formed the habit of always emitting fragrance at night. This strange temper of cordate telosma took several generations to form. Many plants rely on insect pollination to reproduce their offspring. A plant that pollinates by insects that move during the day. During the day, flowers are fragrant and welcome messengers. Cordate telosma is pollinated by moths that appear at night. In the dark, with its strong fragrance, it lures winged "guests" to visit and delivers pollen to them. This habit of cordate telosma is an adaptation to the environment. The petals of cordate telosma are different from those that bloom during the day. The pores on the petals of cordate telosma have one characteristic. Once the humidity of the air is high, it will expand, the pores will expand, and more aromatic oil will evaporate. Although there is no sun at night, the air is much wetter than during the day, so the pores are wide and the aroma is particularly strong. If you pay attention, you will find that the flowers of cordate telosma are more fragrant than sunny days, not only at night, but also in rainy days, because the air humidity is high in rainy days.