Some flowers react to the acidity of the soil by changing colour. Hydrangeas produce blue flowers in acid soils when they take up aluminium, and pink flowers in alkaline soils when aluminium uptake is prevented.
Te whakamahi i tēnei tūemi
Natural Sciences Image Library of New Zealand
Reference: Bo1358Rbt.tif (top); Bo1352Rbt.tif (bottom)
Photographs by G. R. Roberts
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