Hydrangea Reproduction Technology
Commonly used cuttings, ramets, layering and grafting propagation, mainly cuttings, during the rainy season, select the strong twigs on the young mother tree as cuttings. The base of the cuttings needs to be knotted and moistened with mud. The length is about 20 cm. Go to the lower blade. The suitable temperature for cuttings is 13～18℃. After cutting, you need to shade and keep moist. It takes about 15 days to 1 month to get roots. It can be transplanted in the second year after survival. Ram propagation should be carried out before germination in early spring. Separate the rooted branches from the mother plant and plant them directly in a pot. Do not water too much. They should be maintained in a semi-shaded place.
After the new shoots have sprouted, they can be transferred to normal maintenance. Layering propagation can be carried out when the buds are sprouting, and it can grow after 30 days. It will be cut off from the mother plant in the following spring, transplanted with soil, and can bloom in the same year. Generally, high pressure is applied from March to April in spring, and roots can be taken from June to July, and the plants can be cut and planted that year. The seedlings of Viburnum are used as rootstocks for grafting and propagation, and they are easy to survive in spring when they are cut and grafted. Transplanting should be carried out after deciduous or before budding, and it needs to be brought on. The main branch is easy to germinate and grows long. It needs to be pruned properly after flowering to shape the tree.
Hydrangea Cultivation Techniques
The suitable temperature for the growth of hydrangea is 18-28℃, and the temperature in winter is not lower than 5℃. Flower bud differentiation requires 6 to 8 weeks at 5 to 7°C. The temperature of 20°C can promote flowering, and maintaining 16°C after blooming can prolong the flowering period. But the high temperature makes the flowers fade quickly. Hydrangea is a short-day plant that is treated in the dark for more than 10 hours every day, and flower buds are formed in about 45-50 days. Potted hydrangeas are commonly used in pots of 15 to 20 cm. After the potted plants sprout in spring, pay attention to adequate watering to ensure that the leaves do not wither. During the flowering period from June to July, the fertilizer and water should be sufficient, and fertilizer should be applied once every half month. The cultivation should avoid the scorching sun, and 60% to 70% shade is the most ideal. In midsummer, when the sunlight is too strong, proper shade can prolong the flowering period. Remove the flower stems after blooming to promote the production of new branches.
The soil is preferably loose, fertile and well-drained sandy loam. But flower color is affected by soil pH, acid soil flowers are blue, alkaline soil flowers are red. In order to deepen the blue color, aluminum sulfate can be applied during the bud formation period. To maintain the pink color, lime can be applied to the soil. The pot soil should be kept moist, but should not be watered too much, especially in the rainy season, should pay attention to drainage to prevent waterlogging from causing rotten roots. It is better to dry indoor potted plants in winter. If it is too wet, the leaves are easy to rot. The pots are changed every spring. Proper pruning to maintain a graceful plant shape.
During summer and autumn, use diluted iron sulfide solution (more than 1000 times) once a week. When the iron element in the calyx cells increases, the flower color will gradually turn blue. A few rusty nails are buried beside the plants, and a small amount of aluminum sulfide or magnesium sulfide is mixed in when changing the pot.Red
When changing the pot, add less than 1/3 teaspoon of calcium carbonate (ie limestone) powder to the loam according to the amount of pot soil.
Folding Pest control
- There are mainly wilt disease, powdery mildew and leaf spot.
- Use 65% dyssenzine wettable powder 600 times solution to spray for prevention and treatment.
- Insect pests are harmed by aphids and bugs, and can be sprayed with 40% omethoate EC 1500 times liquid.