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Hydrangeas, History, and Summer Beauty at the Arnold Arboretum

In July, the Arnold Arboretum’s landscape comes alive with the broad, luminous blooms of temperate hydrangeas—plants that reward close observation, particularly when encountered in their diversity. Across the Arboretum’s living collections, 183 hydrangeas representing 79 accessions—comprising 15 species and many varieties and cultivars—offer a vivid panorama of form, texture, and color as summer takes hold. Each species tells its own story in the landscape. Bigleaf hydrangea (Hydrangea macrophylla) represents perhaps the most familiar species in American gardens, offering an array of mophead and lacecap flowers whose colors shift with soil chemistry—from saturated blues to pinks…