When will hydrangea blossom?

Hydrangea is a famous ornamental plant in the Yangtze River valley, also known as eight immortals, powder ball, grass hydrangea and so on. The flowers are beautiful in color, plump, large and beautiful, and the flowers can be red and blue, which is pleasing to the eye and spirit. Hydrangeas are planted in the gardens in the south of the Yangtze River during the Ming and Qing dynasties, and the parks built at the beginning of the 20th century are also inseparable from the planting of hydrangeas. Let's take a look at when hydrangeas bloom.

When will hydrangea blossom?

Hydrangea usually blossoms from June to August, and the time from flowering to flower shedding is about 25 days. The color of hydrangea is pink, light blue or white, but the color of hydrangea varies with the pH of the soil or medium. Aluminum sulfate can be applied during bud formation in order to deepen blue, and lime can be applied in the soil to keep pink.

Why don't hydrangeas bloom?

1. Excessive nitrogen fertilizer: nitrogen fertilizer is the main fertilizer in the early stage of Hydrangea flower bud differentiation, and phosphorus fertilizer is the main fertilizer in the differentiation stage, but excessive application of nitrogen and phosphorus fertilizer in autumn and winter will cause plant excess nutrition, growth inhibition, flower bud differentiation and affect flowering in the second year.

2. Weak light: the family cultivation of Hydrangea is limited by conditions and receives less light, which will cause the leaves to grow excessively and grow poorly. The nutrient consumption of leaves is too large, and the nutrition is insufficient during flower bud differentiation, which affects flowering.

3, the light is too long: Hydrangea is a short-day plant, the light time during the flower bud differentiation period can not be more than 10 hours, the eight immortal flowers placed in the room, the light exposure for a long time at night will increase the light and affect the flower bud differentiation.

4. Pruning is uncomfortable: the flowering period of Hydrangea is from June to August, and the flower branches should be pruned after flowering to reduce the loss of nutrients. If the plant is too prosperous and cut again in early spring, it is difficult to form flower branches from June to August, resulting in a decrease in flowering or no flowering.

How to cultivate hydrangea?

1. Soil: loose, fertile and well-drained sandy loam is better for hydrangea, but the color of hydrangea changes greatly due to the change of soil pH. Aluminum sulfate can be applied during bud formation in order to deepen blue, and lime can be applied in soil to keep pink.

2. Watering: the potted soil of hydrangea should be kept moist, but it should not be watered too much, especially in the rainy season to prevent rotting roots caused by waterlogging. It is better to dry indoor potted plants in winter. If it is too wet, the leaves will rot easily.

3. Lighting: Hydrangea is a short-day plant, usually cultivated to avoid the hot sun, 60% to 70% shade is the best. When the light is too strong in midsummer, proper shading can prolong the flowering period.

4. Temperature: the optimum temperature for the growth of hydrangea is 18-28 ℃, and the winter temperature is not lower than 5 ℃. Flower bud differentiation takes 6-8 weeks under the condition of 5-7 ℃. The temperature of 20 ℃ can promote flowering, maintain 16 ℃ after anthesis, prolong the viewing period, and pay attention to the rapid discoloration of flowers caused by high temperature.

5. Fertilization: hydrangea should generally apply thin pancake fertilizer and water every 15 days or so. In order to keep the basin soil acidic, 0.2% ferrous sulfate should be added to turn it into alum fertilizer when applying liquid fertilizer, and 0.5% superphosphate soaking solution should be applied twice during the bud period.

6. Pruning: after Hydrangea blossoms, attention should be paid to the removal of flower stems to promote the production of new branches. Proper pruning can keep the plant shape graceful. In early spring and March, the diseased and weak branches should be cut off from the base, leaving 3-5 strong main branches and truncated, each with 2-3 buds.

7. Insect pests: Hydrangea is mainly caused by wilt, powdery mildew and leaf spot, which can be controlled by spraying 65% Dessen zinc wettable powder 600 times. Insect pests are harmful to aphids and bug bugs and can be sprayed with 1500 times of omethoate EC.

8. Change the basin: hydrangeas generally turn the basin and change the soil once a year, combined with changing the basin to cut off the rotten roots, rotten roots and overlong roots. After the plant is moved into the new pot, the soil should be compacted, then watered thoroughly, placed in a shaded place for about 10 days, and then moved outside for normal management.