Hydrangea is native to China and Japan. Hi warm, moist and semi-yin environment. The suitable temperature for hydrangea growth is 18-28 ° C, and the winter temperature is not lower than 5 ° C. Flower bud differentiation requires 6-8 weeks at 5-7 °C, and the temperature can be promoted at 20 °C. Seeing 16 °C after flowering can prolong the flowering period. But the high temperature makes the flowers fade quickly.
The hydrangea pot 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 rotten roots caused by the cockroaches. In winter, the potted hydrangea in the room is slightly dry. When it is too moist, the leaves are perishable.
Hydrangea is a short-day plant that is treated dark for more than 10 hours per day and forms flower buds for about 45-50 days. Usually cultivated to avoid the sun shining, 60% -70% shading is ideal.
The soil is preferably loose, fertile and well-drained sandy loam. However, the change in soil pH makes the hydrangea’s flower color change 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.