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"In general, more acidic soil will turn them blue or bluish, while basic soil will turn them a more pink color," she advises. She provided this pH scale for hydrangea colors: Bright blue: 4.5
Hydrangea flower color changes based on the pH in soil. As the graph depicts, soil with a pH of 5.5 or lower will produce blue flowers, a pH of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. Hydrangea flower color can change based on the pH in soil.
Mountain hydrangeas like this one have beautiful lacecap flowers which range from blue to pink to white. It does best with some afternoon shade. Varieties of Panicle Hydrangea (Hydrangea paniculata)
Acid rain can range between a pH of 5 and 5.5, but it can be as low as 4 in the northeast. "When pH levels are lower, more acidic, you get that lovely blue color" for hydrangeas, Strahan said. How ...
As the graph depicts, soil with a pH of 5.5 or lower will sprout blue hydrangeas, a ph of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. White hydrangeas can not be manipulated by soil pH, they will always be white because they do not contain pigment for color.
"Eminent panicle hydrangeas." Posts from the Collections, Arnold Arboretum of Harvard University website, 15 July 2019. Retrieved 2 October 2019. Rose, Nancy. "A Parade of Hydrangeas." ARBlog, Arnold Arboretum of Harvard University website, 2 July 2016. Retrieved 2 October 2019.
"This year is going to be a fantastic hydrangea year."
Hydrangea serrata is similar to H. macrophylla except it is a smaller more compact shrub with smaller flowers and leaves; it is also more hardy. With a rounded habit, it features dark green, serrated (toothed), ovate leaves to 15 cm (6 in) long, and clusters of long-blooming blue or pink lacy flowerheads in mid- to late summer.