1, too little water.
Hydrangea is suitable for growing in humid environment. If there is too little water in the environment where hydrangea grows, it will cause hydrangea to become bigger. Therefore, when maintaining hydrangea, it is necessary to replenish sufficient water to plants, and it is best to water hydrangea when the soil is dry and soak the soil completely.
2. The light is too strong
Hydrangea has a certain demand for light during its growth. However, too strong light will cause plant flowers to zoom. Therefore, in the process of hydrangea maintenance, it is necessary to provide suitable illumination for hydrangea, and when the illumination is too strong, it is necessary to shade the hydrangea in time to make the plants grow healthily.
3. Too much nutrition
Hydrangea will consume a lot of nutrients in the process of growth, but frequently providing nutrients to plants during the maintenance of hydrangea will lead to the fertilizer damage and scaling phenomenon of hydrangea, so it is best to provide nutrients to plants reasonably during the maintenance of hydrangea, preferably only during the growth period and flowering period.
growing environment
Hydrangea originated in China and Japan. I like warm, humid and semi-cloudy environment. The suitable growth temperature of hydrangea is 18-28℃, and the winter temperature is not lower than 5℃. It takes 6-8 weeks for flower buds to differentiate at 5-7℃, 20℃ can promote flowering, and maintaining 16℃ after flowering can prolong flowering. But the high temperature will make the flowers wither quickly.
Hydrangea flowerpot soil should be kept moist, but it should not be watered too much, especially in rainy season, to prevent root rot caused by waterlogging. Indoor potted hydrangeas should be slightly dry in winter. If it is too wet, leaves rot easily.
Hydrangea is a kind of short-day plant, which is treated in the dark for more than 10 hour every day and forms flower buds in about 45-50 days. Usually, cultivation should avoid exposure to the hot sun, and 60%-70% shading is the best.
Loose, fertile and well-drained sandy loam is the best soil. However, the change of soil pH makes the color of hydrangea change greatly. In order to deepen the blue color, aluminum sulfate can be applied during bud formation. In order to keep pink, lime can be added to the soil.