How to grow hydrangea of Saxifragaceae? What are the precautions?

Hydrangea, also known as Hydrangea, Hydrangea, is a deciduous sub-shrub of Saxifragaceae. Originated in the south of China, it is not only a famous ornamental flower in the Yangtze River basin and the south, but also a good potted flower in the north. So how to grow hydrangea? What are the precautions?

How to grow hydrangea?

1. Soil

In early spring, the surviving hydrangea seedlings can be transplanted into the basin. When potting, 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 4 parts of compost soil, 5 parts of sand soil and 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. Hydrangea should be changed every 1-2 years in the early spring, into the new culture soil. Remove part of the old soil and rotten roots when changing the basin, and trim it with the change of the basin.

two。 Fertilizer application

Hydrangea like fertilizer, during the growth period, generally every 15 days or so should be applied thin pancake fertilizer and water. 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.

3. Watering

Hydrangea leaves are larger and require more water. The basin soil should be watered frequently in spring and summer to keep the basin soil moist; water should be watered once in the morning and evening in midsummer, and pay attention to proper shade; less watering in winter, as long as the humidity of the basin soil can be maintained; during the growing period, the basin soil should be watered enough to keep the basin soil moist, especially in summer. From May to August, in addition to meeting the water needs of the basin soil, it is necessary to spray water on the leaves once a day. But hydrangea is fleshy root, watering should not be too much, too much water is easy to cause rotten root. The weather is getting cooler after September, so it is necessary to gradually reduce the amount of water to make the branches grow strong so as to facilitate dormancy in winter.

4. Light

Hydrangea likes shade. After leaving the room in spring, it should be kept in a semi-shady environment and moved 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.

5. 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, and prolong the flowering period. But the heat makes the flowers fade quickly.

6. Pick the heart

When the new branch grows to about 10-15 cm, it can be coring and promote branching; when the branch grows to 8-10 cm, the second coring will be carried out to facilitate the plant shape to be symmetrical. After September, the flower buds differentiate, cut the branches short in time after the flowers are shedding, promote the growth of new branches, and then pick out the heart when the new branches grow to 8 cm to 10 cm, so as to enrich the new branches and buds to facilitate flowering in the coming year. After that, the diseased and weak branches should be cut off from the base in early spring and March every year, and 3-5 strong main branches should be retained and cut short, with 2-3 buds in each branch to promote new branches and make them bloom and flourish. 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.

Matters needing attention in planting 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. When moving into the room in the first and middle of October, it is necessary to control watering and keep the room temperature 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. In the annual growth period, generally can hit the top 2 times to promote branching. After flowering, the old branches were kept lumb2 nodes and cut short to control the plant height and promote the growth of new branches. Cut off the top of the new shoots after autumn to stop the branches from growing so as to survive the winter.

The seedlings cut in March can be moved into a 10 cm pot 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.

The main value of Hydrangea

1. Hydrangea flower shape plump, large and beautiful, its color can be red and blue, pleasing to the eye and spirit, is a common potted ornamental flowers and trees.

two。 Cut off the whole bouquet and bottle it into the room, which is also a first-class embellishment. It is more elegant and interesting to hang the bouquet in the bed tent.

Note: once eating hydrangea, abdominal pain occurs a few hours later. Other typical symptoms of poisoning include skin pain, vomiting, weakness and sweating. There are also reports of coma, convulsions and a breakdown of blood circulation in the body.