The latest culture methods and matters needing attention of paulownia

Paulownia, also known as Liuxueni, Luoxue mud, etc., is a perennial herb of the genus Gesneriaceae, with small and exquisite plants, green leaves and colorful flowers, with high cultivation and ornamental value, and a wide variety of horticulture. There are blue, white, red, purple and double, two-color and other varieties, let's take a look at the breeding methods and matters needing attention!

Growth habits of paulownia

Paulownia likes to grow in warm, moist, semi-shaded, bogey direct light and loose, fertile and acidic sandy soil rich in humus. During the growing period, the suitable temperature was 20: 25 ℃, and it was not cold-tolerant. It was dormant when the temperature dropped to about 5 ℃ in winter, and the normal growth of the plant would be affected when the temperature was too high. When the temperature was more than 30 ℃ in summer, the plant would be semi-dormant. Growth period requires high air humidity, do not like floods, to avoid Rain Water intrusion. Winter dormancy period needs to keep dry, such as humidity is too high or temperature is too low, the tuber is easy to rot.

Propagation methods of paulownia paniculata

1. Sowing: soak the seeds for 24 hours before sowing to promote early germination, fill the culture soil with rotten leaf soil, vegetable garden soil and fine sand in a shallow basin or wooden box, spread the seeds evenly after the soil is leveled, cover with glass after moistening the bottom of the basin, and emerge after about 10 days under the humidity of 18: 20 ℃.

2. Dividing balls: the 2-to 3-year-old bulbs which have been dormant are first buried in the soil and watered thoroughly in autumn and kept at room temperature for 22 ℃ to accelerate budding. when the buds grow to about 0.5cm, the balls are dug up and cut into 2 to 4 pieces, with a bud on each piece, and each piece is planted in a pot, that is, to form a new plant.

3. Branch cutting: the method of branch propagation is commonly used in the propagation of paulownia. Twigs often sprout on the tubers, cut 2cm long when cutting, insert them into fine sand or expanded perlite matrix, pay attention to shading, avoid the trend of sunlight, maintain room temperature 18-20 ℃, 15 days can take root.

4. Leaf insertion: select the leaves with strong growth and middle development, cut off half of the leaves together with the petiole from the base, insert the petiole obliquely into the wet sand substrate, cover it with glass and shade, keep room temperature 25 ℃ and high air humidity, and produce healing tissue at the base of the petiole 20 days after insertion.

5. Bud insertion: the bud insertion and propagation of paulownia is generally carried out when the new buds germinate up to 4 cm to 6 cm in spring. the extra new buds are broken off from the base, then inserted into the sand bed, and maintain a certain humidity, after a period of cultivation, blossom from June to July of the following year.

Culture methods of paulownia paniculata

1. Soil: paulownia likes loose, fertile and good water retention humus soil, which should be cultivated with slightly acidic soil rich in humus and loose. It is often prepared with 1 part perlite, 1 part of river sand and 3 parts of rotten leaf soil plus a small amount of rotten and sun-dried fine broken poultry manure. Potted paulownia is commonly used as a mixed substrate of rotten leaf soil, coarse sand and vermiculite.

2. Temperature: the suitable temperature for the growth of paulownia is 10-25 ℃. There are different requirements in different seasons, 18: 25 ℃ from January to October, and 10: 12 ℃ from October to January. The suitable temperature can make the leaves grow luxuriantly and green, and the flowers are large and bright. When the plant is withered and dormant, take out the bulb and hide it in the slightly moist sand.

3. Illumination: paulownia is a semi-positive plant, which should be properly shaded to avoid direct light. There should be plenty of sunshine in the seedling stage in winter, and it must be carefully maintained in a ventilated shade shed with scattered light in summer, the light in the growing period should not be too strong, the sunshading time should be properly prolonged when flowering, and the basin soil should be kept slightly dry during the dormant period in winter.

4. Watering: the big paulownia flowers and leaves are fluffy, and once they are stained with water droplets, they are very perishable, so do not spray water on the flowers and leaves. It is best to use the immersion method to water. Usually appropriate amount of watering, too much is easy to cause tuber rot, leaves withered and yellow, or even the whole plant death. During the period of high temperature in summer, it should be watered once or twice a day, and rain must be avoided during flowering.

5. Fertilization: paulownia should apply mature thin organic liquid fertilizer once a week from leaf expansion to flowering, increase phosphate fertilizer after flower bud formation, do not stain the leaf surface, and spray clear water once after each fertilization. Thin cake fertilizer should be applied every 10-15 days from leaf extension to flowering, and bone powder or superphosphate should be added during flower bud formation.

6. Insect pests: leaf snail pests are easy to occur in the process of breeding, which mainly harm the roots, stems and leaves, making the leaves yellowing and shedding, which will lead to death in serious cases. When it is found that there are red spiders on the leaves, 5% nisolone emulsion can be sprayed 1000 times, the control effect is very good. It is generally sprayed once a week for 2 times in a row.

Matters needing attention of paulownia

1. Avoid water on the leaves: fluff grows on the flowers and leaves of paulownia. Once stained with water, it is very easy to rot, so remember not to spray water on the flowers and leaves, it is best to use the immersion method to water.

2. Appropriate watering in winter: the basin soil should be kept slightly drier during the winter dormancy period, if the temperature is lower than 8 ℃ and the air humidity will cause tuber rot, at the same time, attention should be paid to avoid rain during flowering.

3. Proper shading in summer: high temperature and humidity in summer is disadvantageous to plant growth, so it should be properly shaded and maintained in a place with scattered light and good ventilation, otherwise it is easy to cause leaf withering.

4, do not stain the leaves: do not stain the leaves when applying fertilizer, spray clear water once after each fertilization, keep the leaves clean, wipe the leaves immediately after cleaning to prevent decay.