Hydrangea Flower Color Ph. Planting hydrangeas near a concrete foundation or sidewalk will often affect the color since the pH of the soil may be raised considerably by lime leaching out of these structures making it difficult to obtain blue. 29082018 Remember the aluminum availability chart above.
To achieve purple shades aim for a. Planting hydrangeas near a concrete foundation or sidewalk will often affect the color since the pH of the soil may be raised considerably by lime leaching out of these structures making it difficult to obtain blue. French hydrangeas growing in alkaline soil have pink flowers.
You see for most French hydrangeas Hydrangea macrophylla the flower color indicates the pH of the soil.
Generally speaking acidic soil with a pH lower than 60 yields blue or lavender-blue hydrangea blooms. In acid or weekly acidic 65 or nearing a neutral ph of 70 soils with lower concentrations of aluminum bigleaf hydrangea flowers turn purple. To lower your pH add. The pH of the soil can also be altered by adding other components to.