One branch method:
In early spring and February, when the new buds germinate and the new leaves don't spread, take the plants out of the pot, shake off the soil at the roots, cut off the tender stems with fibrous roots around the roots with a sharp knife, plant two or three plants in the pot, water the soil two or three centimeters higher than the old soil marks, and put them in the shade. After the new leaves grow, they can bloom in the same year according to the conventional management.
When dividing plants, we should pay attention to two points:
(1) In due time, if the new leaves of the old plants have expanded, the roots will be easily damaged and the survival rate will be low. Plants can also be divided in late autumn dormancy, but the survival rate is not high.
(2) only once every two or three years, not once a year.
Propagation method of bilateral rooting line:
1 At the end of each year 10, the roots of plants are dug out and washed with clean water. Disinfect in 0.2% potassium permanganate for 5 minutes. Dry in the shade after taking out 12 hours.
Cut all the roots into 10 cm with a sharp blade. Seal the incision with wax.
3 First spread 10 cm river sand on the ground, and then put the roots on the river sand in turn, covering the river sand with a thickness of 2 cm. Shading treatment. Spray water once every half month, and spray it thoroughly.
The next spring, each root will grow lateral buds.
Note: direct touch by hand is not allowed in the whole process. De sterile gloves. Prevent contact with bacteria on your hands.
Third, sowing:
When the seeds are ripe, they will be picked and sown, but it takes three years for the seedlings to bloom, so they are generally not used for family breeding, but only used by the garden department for batch breeding or cultivating new hybrid varieties.
4. Tissue culture:
After disinfection, the tuberous roots of flowers can be cultured and propagated by professional tissue culture laboratories. Can multiply rapidly in large quantities. After the plant is produced, the root system is stronger, the lateral roots are obviously increased, and the plant does not carry the virus. More resistant. It is the most advanced mode of production at present. It is also one of the inevitable production methods of various flowers in the future.
Five grafting:
Taking Paeonia lactiflora as female parent, the grafting method was adopted. water
Poached peony is a fleshy root, which is slightly drought-tolerant and afraid of water accumulation. Therefore, it is necessary to water properly according to the weather, soil moisture and plant growth, and adhere to the principle of "no watering, dry watering, thorough watering and no soaking". Spray 1 time every sunny day or every other day in spring, autumn and summer, and spray 1 time on cloudy days for 3~5 days. Keeping the soil semi-dry often is beneficial to its growth; Too wet is easy to rot roots, too dry is bad for growth, and leaves turn yellow. In midsummer and winter dormancy, the basin soil should be relatively dry and slightly moist. Before pouring, pour 1 frost, which is good for cold protection. After pouring frozen water in winter, cover it with straw or leaves to keep warm.
Fertilize soil or land
Paeonia lactiflora likes fertilizer and grows well in loam rich in humus. The ground should be planted in a higher place. Before planting, the bed soil should be deeply turned over and decomposed organic fertilizer should be applied. Topdressing can be combined with irrigation during the growth period; During the growth period of 10~ 15 days, apply dilute NPK fertilizer 1 time to make it grow vigorously. After the flower buds develop color, fertilization is stopped and fertilization is not applied during dormancy.
decrease
High temperature in summer, withered stems and leaves enter dormant period, and dead branches can be cut off; In order to improve the ventilation and light transmission conditions of Paeonia lactiflora and concentrate nutrition, it should also be pruned after falling leaves in autumn and winter. Cut off branches that are too dense in the growth period, such as concurrent branches, cross branches, inward branches, pest branches, etc., to keep the plant beautiful.
live through the winter
In late autumn and early winter, potted peony can be buried in the soil, with its branches exposed and covered with grass or soil to protect it from wintering. Others put flower pots directly into the cellar for the winter. In the following spring, remove the plastic film, move it out of the kiln, and place it in a ventilated and sunny place to strengthen the management of fertilizer and water to make it bloom naturally. Some are placed in greenhouses or plastic greenhouses to promote their early flowering according to the needs of festivals. However, in the northern region, the first frost is moved indoors for maintenance. As long as the room temperature is kept above 5℃, it can survive the winter. leaf spot
At the initial stage of symptoms, dark brown spots appeared on the leaves, which then expanded into irregular wheel lines and finally produced black mildew spots.
cause of a disease
Plant diseases with local necrotic spots mainly occur on leaves invaded by pathogenic bacteria, which are the main diseases caused by fungi, bacteria and nematodes. Most bacteria are spread by airflow, wind and rain, and sometimes by insects. Infection usually persists during the growing period. Leaf spot disease occurs under the climatic conditions of heavy rainfall, frequent rainfall and suitable temperature.
Prevention and cure method
Rational fertilization and watering, ventilation and light transmission, improve plant disease resistance; Spraying 0.5% ~ 1% bordeaux solution before onset to prevent it; In the early stage of the disease, when the disease is mild, remove the diseased leaves in time, burn them centrally or bury them deeply to reduce the source of infection; Spraying 600 times of 65% zineb wettable powder at the initial stage of onset, spraying/kloc-0 every 1 0 ~/5 days, and spraying continuously for 3~4 times; Spraying 50% carbendazim 1000 times solution or 80% zineb 500-800 times solution and 70% thiophanate-methyl wettable powder 1000 times solution at the onset stage.
scale insect
The insect body of scale insects is wrapped by horny shells, so it is not easy to be sprayed directly. It sucks the juice of plants like a louse that sucks human blood, thus causing great harm to flowers and trees; The damaged plants not only grow poorly, but also have yellow leaves and early defoliation, which will make the plants wither and die seriously. This insect's excrement "honey dew" often causes coal stains and blackens leaves and branches.
cause of a disease
Poor ventilation, insufficient light, too dense planting and improper fertilization will all lead to diseases.
preventive measure
Pay attention to ventilation, increase light, place it properly, don't plant it closely, increase fertilizer and water management, prune frequently and pay attention to prevention.
Prevention and cure method
Mainly using natural enemies, supplemented by chemicals. The main natural enemies are red ladybug, Australian ladybug, little red ladybug and red ring ladybug. These ladybugs eat a lot in summer, reproduce quickly and kill a large number of scale insects. In winter or early spring, the newly hatched nymph takes a long time, which is more suitable for taking medicine. 50% chlorfenapyr EC 1000~ 1500 times or 80% dichlorvos EC 1000~1500 times, 40% omethoate EC1000 ~. In winter, the scale insects were sprayed with Pomei 1% sulfur mixture during the dormant period.