Hydrangea has a suitable temperature range of 18 to 28 ° C and a winter temperature of not less than 5 ° C. Flower bud differentiation requires 6 to 8 weeks at 5 to 7 °C. The temperature at 20 °C can promote flowering. When the flower is maintained at 16 °C, the flowering period can be prolonged. But the high temperature makes the flowers fade quickly.
The potting soil should be kept moist, but the watering should not be too much. In particular, the rainy season should pay attention to drainage to prevent the rotten roots caused by the bedding. In the winter, the indoor potted plants are slightly dry. When it is too dry, the leaves are perishable.
Hydrangea is a short-day plant that is treated dark for more than 10 hours a day, forming flower buds for about 45 to 50 days. Usually cultivated to avoid the sun shining, 60% to 70% shading is ideal.
The soil is preferably loose, fertile and well-drained sandy loam. However, the change in soil pH makes the color of hydrangea vary greatly. In order to deepen the blue color, aluminum sulfate can be applied during the flower bud formation period. To maintain a pink color, lime can be applied to the soil.
Commonly used ramets, beading, cuttings and tissue culture.
Bacterial reproduction: It should be carried out before germination in early spring. Separate the rooted shoots from the mother plants, directly potted, watering should not be too much, and maintain in the semi-yin, and then transfer to the normal conservation after the sprouts are sprouted.
Blasting: When the buds are germinated, they can grow after 30 days, cut off with the mother plants in the spring of the next year, and transplant with soil, which can bloom in the same year.
Cutting propagation: in the rainy season. Cut the top twigs, about 20 cm long, remove the lower leaves, the appropriate temperature for cutting is 13 ~ 18 ° C, rooting 15 days after insertion.
Potted hydrangea is commonly used in 15 to 20 cm pots. Potted plants should be fully watered after germination in spring to ensure that the leaves do not wither. During the flowering period from June to July, the fertilizer and water should be sufficient, and fertilize once every half month. When the summer light is too strong, proper shade can extend the flowering period. After flowering, the stems are removed to promote the production of new shoots. The color of the flower is affected by the pH of the soil, the acid soil is blue, and the alkaline soil is red. Change the basin once a year in spring. Properly trimmed to keep the shape of the plant beautiful.
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