How to promote the change of flowers and colors of the eight Immortals

The eight immortal flowers belong to Saxifragaceae and Saxifragaceae, with emerald leaves, large inflorescences and changeable flower colors. It is one of the potted flowers welcomed by urban residents in recent years. Due to the soil or medium used for planting, as well as the application of organic fertilizer or nutrient solution, it presents different flower colors, and will change with the change of acidity and alkalinity in the soil or medium. Petal color generally changes from dark to light, that is, from lavender, blue to water red, or even white. When the soil or medium is acidic, the flower color is dark blue or lavender. When the soil or medium shows alkaline reaction, the flower color is water red. In the process of cultivation, according to your preference for flower color, you can adjust the pH value of the soil through water and fertilizer with different acidity and alkalinity, so as to change the flower color to your favorite flower color. For example, the real pH value of soil can be measured with pH test paper. The pH value is neutral soil between 6.5 and 7.5, acidic soil with pH value between 5.0 and 6.5, strongly acidic soil with pH value less than 5.0, alkaline soil with pH value between 7.5 and 8.5, and strongly alkaline soil with pH value higher than 8.5. In order to make the flower color dark blue, a small amount of aluminum sulfate, sulfur powder (100 g / m3 to 200 g / m3), edible rice vinegar (200 to 300 times liquid), ferrous sulfate (0.3%) and so on can be applied at the flower bud stage. If the flower color becomes pink, a small amount of lime powder can be added to the soil, or it can be adjusted by alkaline plant ash solution, which can transform it to alkaline state and make the flower color dark blue or light purple.