The color of the flower petals of a hydrangea plant can change as the acidity of the soil changes because the color of the petals is directly related to the concentration of aluminum ions in the soil.
Hydrangea plants are able to absorb aluminum ions from the soil through their roots. The concentration of aluminum ions in the soil determines the color of the petals of the hydrangea flowers. In acidic soils, the concentration of aluminum ions is high, which leads to blue or purple flower petals. In neutral or alkaline soils, the concentration of aluminum ions is low, which leads to pink or red flower petals.
Therefore, the factor that directly affects the color of the flower petals of a hydrangea plant is the acidity of the soil, which determines the concentration of aluminum ions that the plant is able to absorb.
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