Hydrangea involucrataHydrangea involucrata

  • BOTANICAL NAME: Hydrangea involucrata
  • PRONUNCIATION: hye-DRAN-ja in-VOL-u-krot-uh
  • COMMON NAME: Bracted Hydrangea
  • FAMILY: Hydrangeaceae
  • NATIVITY: Japan, Taiwan
  • GROWTH HABIT: Upright habit of many erect, usually unbranched stems.
  • SIZE: 3-4' height by 3-4' width
  • HARDINESS: Zones 6(7) - 9
  • CULTURE: Evenly moist, acid, organic-laden, well-drained soil in partial shade.
  • LANDSCAPE USE: Single use or massed; mixed border, woodland plant
  • FOLIAGE: Light to medium green, broad-ovate to oblong, 3-6" long, 1-2.5" wide, finely serrated (bristle-tipped), rough above with short, 3/4-1" long petioles. New emerging growth covered with pale brown bristly pubescence.
  • BUDS: Covered with approximately 6, broad-ovate bracts, which open outward and persist with flattened white hairs.
  • FLOWER: Irregular corymbs, 3-5" wide, composed of numerous, small, pink to blue fertile flowers and relatively few, long-pediceled, white, pale blue, or light pink, 3/4-1" wide, sterile flowers composed of 3-5 sepals. Open late, typically late July, August. Sepal color is affected by aluminum and on more acid soils will be bluer.
  • FRUIT: Tomentose capsules
  • PROPAGATION: Cuttings
  • CULTIVARS:
    • 'Wim Rutten' Blue Bunny™ - This dwarf plant is ideal for small gardens or containers. The summer lacecap inflorescences have pale blue to white sterile flowers and deeper blue fertile flowers. Unlike other hydrangeas, the plant continues to produce new flowers into the fall, so there is always fresh color on the plant.

 

University of Delaware

University of Delaware Botanic GardensNewark, DE 19716Phone: 302 831-0153