Hydrangea is a genus of about 70-75 species of flowering plants native to southern and eastern Asia and North and South America. In most species the flowers are white, but in some species, can be blue, red, pink, light purple, or dark purple. In these species the exact colour often mirrors the pH of the soil; acidic soils produce blue flowers, neutral soils produce very pale cream petals, and alkaline soils results in pink or purple.
Spotted at the Garfield Park Conservatory on April 27, 2012.
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