Hydrangea macrophylla
💚
Family : Hydrangeaceae - Saxifragaceae
Cohort : Rosales
Series : Calyciflorae
Sub class : Polypetalae
Class : Dicotyledons 😍 💚💚💚Tʜᴇ ᴘH ᴅᴇᴛᴇᴄᴛᴏʀ💚💚💚 Hydrangea macrophylla, also called bigleaf or French hydrangea, has either pink or blue flowers. Flower color is determined indirectly by the soil pH, which affects the availability of aluminum in the soil. In acid soils, the flowers will be blue, but in alkaline soils, the flowers will be pink. Aluminum is available to the plant in acid soils. Research has determined that the actual mechanism of color variation is due to the presence or absence of aluminum compounds in the flowers.
For blue flowers, maintain a soil pH between 5 and 5.5. Apply aluminum sulfate or sulfur to reduce the pH to this range when you see new growth emerging in April. For application rates refer to the tables in fact sheet HGIC 1650, Changing the pH of Your Soil. Information on soil testing is available in fact sheet HGIC 1652, Soil Testing.
For pink flowers, maintain a soil pH of 6 or more by liming your soil. For more information on selecting a liming material and time of application, refer to fact sheet HGIC 1650, Changing the pH of Your Soil.💚
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