Unlocking Vibrant Hues: Expert Reveals How to Change Hydrangea Colors

Hydrangea Hues: Unlocking the Secret to Vibrant Garden Colors A recent online video by gardening enthusiast "Сад з нуля" (Garden from Scratch) has shed light on the fascinating ability of bigleaf hydrangeas to change their flower color. The video, uploaded on July 25, 2025, provides practical advice for gardeners looking to transform their pink hydrangeas into stunning shades of blue or deep purple. According to the gardening expert, the key to this color transformation lies in soil acidification. This process involves altering the pH level of the soil, which influences the availability of aluminum to the plant, ultimately affecting the pigment in the flowers. The video specifically recommends using aluminum sulfate, also known as alum, to achieve the desired acidic conditions. Crucially, the video emphasizes the timing of this intervention. "To achieve a color change, you need to acidify the soil at the stage of shoot formation, before the buds fully develop," the author explains. Applying acidifying agents during the flowering period will not yield the desired results, as the color is already set. Gardeners are advised to begin this process after the plant has overwintered and started producing new shoots. Beyond color alteration, the video also offers general care tips for hydrangeas. It highlights that hydrangeas do not thrive in direct sunlight and prefer locations with morning sun or dappled shade throughout the day. The author demonstrates her own hydrangeas, which are situated in a spot receiving only morning sun, showcasing their healthy and vibrant appearance. Additionally, for varieties that bloom twice a year, the video suggests pruning spent flowers to encourage a second flush of blooms. This detailed guide provides valuable insights for both novice and experienced gardeners aiming to cultivate more colorful and robust hydrangeas.

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