Poinsettia Flowering Management

Poinsettia is a deciduous upright shrub of the genus Euphorbia, native to Central America and Mexico. It is an important commercial potted plant in Europe, America and Japan. It is cultivated in northern China. The natural flowering period is from November to March of the following year. The flowers are colorful, with red, white, pink and other colors. Leaves prosperous, single leaves alternate, leaves elliptic or broadly lanceolate, 10 to 15 cm in length, pilose on the abaxial surface, and the leaves (also known as bracts) born on the branches are narrow.

First, temperature Poinsettia is weak in cold, must move into the greenhouse before the next frost. The suitable temperature for the growth of Poinsettia is 18°C～28°C, and the room temperature in winter is 16°C～18°C, and the temperature should not be lower than 15°C. Otherwise, the bluish-purple film will become blue, and the base leaves will turn yellow and fall off. Temperature has a great influence on flower bud differentiation. Under short-day conditions, the suitable night temperature for flower bud differentiation is 21°C, and the temperature is higher than 21°C, which will hinder flower bud differentiation. In the later period of growth, the temperature dropped to 18°C, which helps the turning of the sepals, slowing down the inflorescence maturation and delaying flowering. The temperature difference between day and night affects the length of the internodes of poinsettia. The temperature difference between day and night is large and the internodes are longer. The temperature difference between day and night is small, and the plants become short and the internodes shorten. Therefore, the temperature difference between day and night can be used to adjust the plant height and growth rate.

Second, light illumination is a very important factor for plant growth, because it is related to plant photosynthesis. Poinsettia prefers a warm, sunny climate with a light intensity of 20,000 luxes during flowering. If the light is too weak, the branches will be thin and thin, the internodes will be longer, the foliage will be larger, the flowering will be delayed, and the flowers will be dropped early. However, it can not be cultivated directly in the sun, otherwise it will cause the leaves and bracts to become smaller, the leaf edges scorch and grow slowly.

Third, flowering regulation of euphorbia pulcherrima is a typical short-day plant. Flower bud differentiation is greatly influenced by sunshine duration. When the nighttime temperature is lower than 21°C, the critical day length is 12 hours and 20 minutes, which means that when the sunshine time is longer than 12 hours and 20 minutes, the flower buds stop differentiation. In the area south of the Yangtze River, its critical day length is in late September, while in the north of the Yangtze River, its critical day length is in mid-September. Therefore, under natural conditions, poinsettia starts flower bud differentiation in the fall, and the exact date of flowering differs slightly depending on the environment. Therefore, the flowering period can be controlled through this day length requirement of poinsettia. (a) to promote cultivation. By increasing the darkness by covering the shady curtains and simulating the sun setting, a dark period of about 14 hours a day is required, from darkness processing from 5 pm every day to 8 am the following morning. Such darkness continues until flowering, and if the night temperature is higher than 21°C, the dark period will increase. (b) Suppress cultivation. Flowers can be interrupted by interrupting the dark period. An area of ​​1 meter above the plant, an average area of ​​2 square meters, and a 60-watt fluorescent lamp, from 8pm to 12pm or from 10pm to 2am for about 4 hours of light treatment, can stop Plants undergo flower bud differentiation.

4. Moisture Poinsettia is more sensitive to moisture. When water is lacking, the leaves droop. If the water shortage is not serious, it will be restored after watering; if there is too much water, watering will cause the lower part of the plant to yellow or cause the whole plant to die. However, it is not that the leaf sag is a lack of water. It depends on the cultivation substrate. Generally, 1/3 of the topsoil is dry, and it should be watered.

Fifth, the fertilizer should be used to spend a flowering red flowering time on the 3rd 1000-times Irrigation root, irrigation every 10 to 15 days. If nitrogen deficiency occurs during this period, if the leaves appear light green or yellow and become smaller, they should be supplemented several times with a lot of 600 to 800 times.

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