Tuff Stuff Ah-Ha® Reblooming Mountain Hydrangea Hydrangea serrata

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  • Tuff Stuff Ah-Ha® - Reblooming Mountain Hydrangea - Hydrangea serrata
  • flower
  • leaf
  • hydrangea_tuff_stuff_ah-ha_04.jpg
  • a small garden with flowers
  • flower
  • a group of white flowers
  • flower
  • a group of flowers
Exposure
  • Part Sun to Sun
  • Sun
Flower Season
  • Summer
  • Fall
Mature Size
Height: 2' - 3'
Spread: 2' - 3'

This plant is hardy in zones 5 - 9

Zones are based on the average annual extreme minimum temperature an area is expected to receive during the winter. They are used to determine whether a plant is likely to be perennial in your area. If the number in the green box below is within the zone range listed for the plant, it will be hardy for you and thrive in your climate.

  • 5
  • 6
  • 7
  • 8
  • 9

What is my hardiness zone?

NORTH BAY, ONTARIO 
ZONE 4

  • FEATURES

    When it comes to blooming, Tuff Stuff Ah-Ha® hydrangea can't stop, won't stop! 

    At first glance, it would appear that we decided to introduce this beautiful mountain hydrangea solely for its waterlily-like double florets. But that's only part of the story - it's also a prolific rebloomer. All summer long, it devotes its energies to creating flower buds on its new growth so that you have a constant supply of fabulous blooms from early summer through frost. Tuff Stuff Ah-Ha® hydrangea will bloom pink or blue, depending on soil chemistry. 

    Tuff Stuff Ah-Ha hydrangea is featured in our "Power Puff Girl" magazine ad.

    Top reasons to grow Tuff Stuff Ah-Ha hydrangea:

    • Creates new flower buds all summer long.
    • Double florets look like pink or blue waterlilies.
    • Flower buds are more cold-tolerant, which ensures good blooming even in USDA zones 5 and 6.
    Continuous Bloom or Rebloomer

    CHARACTERISTICS

    Plant Type: 
    Shrub
    Shrub Type: 
    Deciduous
    Height Category: 
    Short
    Garden Height: 
    24 - 36 Inches
    Spacing: 
    24 - 36 Inches
    Spread: 
    24 - 36 Inches
    Flower Colors: 
    Blue
    Pink
    Flower Shade: 
    Pink or Blue
    Foliage Colors: 
    Green
    Foliage Shade: 
    Green
    Habit: 
    Mounded
    Container Role: 
    Thriller

    PLANT NEEDS

    Light Requirement: 
    Part Sun to Sun
    Sun

    The optimum amount of sun or shade each plant needs to thrive: Full Sun (6+ hours), Part Sun (4-6 hours), Full Shade (up to 4 hours).

    Maintenance Category: 
    Easy
    Blooms On: 
    New Wood
    Old Wood
    Bloom Time: 
    Summer through Fall
    Hardiness Zones: 
    5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
    Water Category: 
    Average
    Uses: 
    Border Plant
    Container
    Cut Flower
    Edging Plant
    Landscape
    Mass Planting
    Specimen or Focal Point
    Uses Notes: 

    Tuff Stuff Ah-Ha hydrangea works in many landscape applications. We recommend a minimum of 4 hours of sun each day for best flowering and color. In hot climates, shade during the hottest part of the day is imperative.

    Maintenance Notes: 

    Tuff Stuff Ah-Ha hydrangea does not need pruning except to remove any dead wood in early spring. You should not cut back or trim this plant at any time of the year, as doing so will remove flower buds. Hydrangeas are shallow-rooted and benefit from a 2-3" layer of shredded bark mulch. If you wish, you may fertilize in early spring, once the ground has thawed, with a granular fertilizer formulated for woody plants, like a rose fertilizer. 

    This plant does not require deadheading, though if you wish to remove spent flowers, you may - we made a video showing how to do this.

    Learn all about lacecap hydrangeas in our complete guide. 

    Fun Facts: 

    Mountain hydrangeas, Hydrangea serrata, are native to the same areas of Japan as big-leaf hydrangea, Hydrangea macrophylla. However, big-leaf hydrangeas grow along the mild coast while mountain hydrangeas grow up in the mountains. As a result, they have naturally developed flower buds that are more tolerant to cold conditions than big-leaf hydrangeas, so they bloom more reliably in USDA zones 5 and 6.

    Tuff Stuff Ah-Ha® Hydrangea serrata 'SMNHSDD' USPP 29,832, Can 6,515
    PICTURES AND INFORMATION COPIED FROM PROVEN WINNERS 
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