A: The hydrangea is a plant of the genus Saxifragaceae and Hydrangea. Its leaves are green, its inflorescences are huge, and its color is changeable. It is one of the potted flowers that has been welcomed by urban residents in recent years. Due to the different soils or media used for planting, and the organic fertilizer or nutrient solution applied, different flower colors will appear, and will change with changes in the pH of the soil or medium. The color of the petal usually changes from dark to light, that is, from lavender, blue to water red, or even white. When the soil or medium is acidic, the color appears dark blue or lavender. When the soil or medium is alkaline, the color of the flower appears red. In the cultivation process, the pH of the soil can be adjusted according to your preference for flower color, water and fertilizer with different pH, and the color of flowers can be changed toward your favorite color. For example, the pH of the soil can be measured first using a pH test paper. The pH is between 6.5 and 7.5 neutral soil, the pH is between 5.0 and 6.5 is acidic, and the pH is less than 5.0 is strongly acidic. Between 7.5 and 8.5 alkaline soil, above 8.5 strong alkaline soil. To promote its dark blue color, a small amount of aluminum sulfate, sulfur powder (100 g/m2 to 200 g/m3), edible rice vinegar (200 to 300 times liquid), and ferrous sulfate can be applied at the flower bud stage ( 0.3%) etc. If the flower color is changed to pink, a small amount of lime powder can be added to the soil, or it can be adjusted with an alkaline grass ash solution, which can transform it into an alkaline state and make the flower color dark blue or light purple.
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