How to raise potted hydrangea?

Hydrangea is a common potted ornamental flower, also known as eight immortal flowers, powder ball, grass hydrangea, etc., for Saxifragaceae Hydrangea shrub plant, the ornamental value is very high, the flower shape is plump, large and beautiful, and its flower color can be red and blue, pleasing to the eye and spirit. Modern parks and scenic spots are planted into pieces to form a landscape. Let's take a look at how to raise potted hydrangea.

Growth habits of Hydrangea

Hydrangea prefers warm, humid and semi-overcast environment, the optimum temperature for growth 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, and prolong the flowering period. But the heat makes the flowers fade quickly. Potted soil to keep moist, but watering should not be too much, especially in the rainy season to pay attention to drainage, to prevent waterlogging caused by rotting roots, indoor potted hydrangea in winter to slightly dry, too wet leaves are easy to rot. Short-day plants are treated in the dark for more than 10 hours a day, and flower buds are formed in about 45-50 days. Usually, they should be cultivated to avoid the hot sun, and 60-70% shading is the best. Loose, fertile and well-drained sandy loam is the best soil, but the change of soil pH makes the flower color of hydrangea change greatly.

Propagation method of Hydrangea

1. Ramet: ramet should be carried out before sprouting in early spring, the rooted branches should be separated from the mother plant, pot directly, watering should not be too much, and should be maintained in semi-shade, and then transferred to normal maintenance after sprouting new buds.

2. Pressing: the pressing is carried out when the bud germinates and can grow after 30 days. It is cut off from the mother plant in the next spring and transplanted with soil, and it can blossom in the same year.

3. Cutting: cutting in the rainy season, cutting the top twigs, about 20 cm long, picking off the lower leaves, cutting the appropriate temperature of 13-18 ℃, rooting 15 days after cutting.

How to raise potted hydrangea?

1. Soil: the soil for hydrangea planting should be sandy loam with loose, fertile and good drainage. When pot planting, it is appropriate to use 4 parts of rotten leaf soil, 3 parts of garden soil, 2 parts of river sand and 1 part of cake fertilizer. Or with 4 parts of compost soil, 5 parts of sand soil, 1 part of cake fertilizer, or 6 parts of rotten leaf soil, 3 parts of sand (or slag) and 1 part of cake fertilizer. Pour water into the basin, put it indoors for maintenance, and leave the room in early May.

2. Watering: Hydrangea leaves are larger and require more water. Water frequently in spring and summer to keep the basin soil moist. When it is hot in summer, water should be watered once in the morning and evening, and pay attention to proper shade. Less watering in winter, as long as the basin soil humidity can be maintained. During the growing period, watering should be sufficient to keep the basin soil moist, especially in summer.

3. Lighting: Hydrangea is a short-day plant, which should be kept in a semi-shady environment after leaving the room in spring, and move to a well-ventilated shady place in midsummer to prevent sunburn in leaves. After September, the light intensity weakens day by day. In order to promote flower bud differentiation, the flowerpot should be moved to a place with more light.

4. Temperature: Hydrangea prefers warm environment, the suitable temperature for growth 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 likes fertilizer. During the growth period, thin pancake fertilizer and water should be applied every 15 days or so. In order to keep the acid reaction of the basin soil, 0.2% ferrous sulfate can be added when applying liquid fertilizer to turn it into alum fertilizer. The application of 0.5% superphosphate soaking solution twice during the bud period can promote the flower to be large and colorful.

6. Pruning: every year in early spring and March, Hydrangea should cut off diseased and weak branches from the base, retain 3-5 strong main branches and cut them short, leaving 2-3 buds in each branch to promote new branches and make them bloom luxuriantly. Through pruning and shaping, the tree can be compact, plump, symmetrical, with many flowers, large flowers and bright colors. If not pruned, the base of the old branch of more than 3 years has been lignified, and it is not easy to germinate new branches, which is easy to form the emptiness in the lower part of the plant and affect the ornamental value.

7. Diseases and insect pests: the main diseases of hydrangea are wilt, powdery mildew and leaf spot, which can be controlled by spraying with 65% zinc wettable powder 600 times. The main pests of hydrangea are aphids and bug bugs, which can be sprayed with 1500 times omethoate EC.

Matters needing attention in Hydrangea

1. Hydrangea prefers acid soil and is not resistant to barren and saline-alkali soil. It grows poorly in alkaline soil, and its branches and leaves turn yellow, so it is suitable for acid soil which is loose, fertile and rich in humus. Its flower color can change from white to red and from red to cyan due to the influence of pH.

2. Hydrangea is moved into the room in the first and middle of October. Watering should be controlled and room temperature should be kept at about 5 ℃ to promote its dormancy. Remove the leaves before entering the room to avoid rotten leaves. From the middle of December, it moved to the sunny place, keeping the temperature 15: 20 ℃, promoting the growth of branches and leaves, and leaving the chamber in late April of the following year.

3. Hydrangea cuttings in March can be moved into a 10 cm basin after rooting, and then planted in a 16 cm basin in the middle of June. The heart was picked for the first time in June. If the heart is plucked in early June, flower buds can be formed in the middle of August. The seedlings cut from May to June can be planted in 16 cm pots from July to August. In order to promote the formation of flower buds in that year, the last coring must be before September, otherwise the flower buds can not be formed in the same year.