Hydrangea flower and soil acidity

Numéro d’image : 11708078
Hydrangea flower and soil acidity
Effect of soil acidity. Flowers of hydrangea plants (Hydrangea macrophylla) that have been grown in soils with different acidity. At left is a flower from an acidic soil (pH less than 7) with a characteristic pink colour. At right the flower was grown in alkaline soil (pH more than 7) resulting in blue flowers. At centre the flower was grown in neutral soil,so both colours are present combining to make purple. The difference is due to the way aluminium ions in the soil react with the plant's pigments
Licence : Droits gérés
Crédit: Science Photo Library
Taille de l’image : 8000 px × 2667 px
Model Release : Non requis
Property Release : Non requis
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