Hydrangea arborescens Incrediball
Hydrangea 'Incrediball' phot courtesy of Spring Meadow Nursery

Smooth Hydrangea

'Incrediball' is an improved version of the garden classic 'Annabelle' hydrangea, but with strong, sturdy stems that don't flop over and extra-large blooms to boot. White flowers begin to appear in mid-summer and open to enormous snowballs, nearly the size of basketballs! They then age to a lush jade green, which persists through frost. It's a super easy, super reliable North American native that is hady to zone 3.  

  • Height: 120-150 cm (4-5 ft)
  • Spread: 120-150 cm (4-5 ft)
  • Hardiness: Zone 3-8
  • Sun or Shade: minimum four hours of direct sun
  • Bloom Time: mid summer to fall
  • Leaf Colour: dark green
  • Bloom Colour: white

Growing and Maintenance Tips

For the biggest, most abundant blooms and strongest stems, plant where it gets at least six hours of sun each day.  A good layer of shredded bark mulch helps minimize water loss.  To prune cut the entire plant back by about one-third its total height each spring, just as the new growth begins to emerge on stems. This serves to build up a strong, supportive, woody base while also encouraging abundant new growth for plenty of flowers.