Summary
Hydrangeas can change flower colors, but the transformation depends on soil chemistry rather than magic. Bigleaf and mountain hydrangeas respond to soil pH and aluminum availability. Acidic soil, with a pH of 4.5 to 5.5, encourages blue flowers, while less acidic or neutral soil, around 6.0 to 7.0, produces pink or mauve blooms. Gardeners should test soil before adding amendments such as aluminum sulfate, sulfur, soil acidifiers, garden lime, or wood ash. Changes take weeks or months, so patience is essential. Regular testing and consistent applications help maintain the desired color, although flowers eventually return toward their natural shade when amendments stop.
Gardener's Path
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