Hydrangeas are popular ornamental plants, grown for their large flowerheads. In many species, the flowerheads contain two types of flowers, small fertile flowers in the middle of the flowerhead, and large, sterile bract-like flowers in a ring around the edge of each flowerhead.
In most species the flowers are white, but in some specie can be blue, red, pink, light purple, or dark purple. The colors of some Hydrangeas flowers are affected by the relative availability of aluminum ions in the soil. Acidic soils with a pH of less than 5.5 produce blue flowers; soils with a pH greater than 5.5 product pink flowers. White flowers are not affected by pH.
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