Plant Profile: Hydrangea macrophylla

Hydrangea macrophylla is a shrub that thrives in shady environments and can produce either round flower clusters known as "Mopheads" or flat arrangements of smaller blooms encircled by larger flowers, referred to as "Lacecaps." The color of the flowers varies from white to shades of pink, blue, or purple, influenced by the acidity of the soil. Specifically, blue flowers emerge in acidic conditions (with a pH of 5.0 to 5.5), while pink flowers are a result of more alkaline soil (pH levels of 6.0 to 6.5). To lower soil acidity, aluminum sulfate can be introduced, whereas lime can be used to increase alkalinity. This hydrangea is adaptable to both clay and sandy soils and exhibits some resistance to salt. However, it is vulnerable to deer damage.

While this plant can tolerate sunny conditions if the soil remains adequately moist, it thrives best in locations that provide afternoon shade. It typically blooms in late spring and summer, relying on the growth from the previous year, known as "old wood."

Generally, Hydrangea macrophylla is free from pests and diseases, although it may experience issues such as leaf spot, bacterial wilt, and powdery mildew under certain circumstances.

For further details on Hydrangea, please refer to additional resources.