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Tuff Stuff Ah-Ha® Reblooming Mountain Hydrangea Hydrangea serrata

Flower Season
  • Summer
  • Fall
Mature Size
3' 3'
Height: 2' - 3'
Spread: 2' - 3'
  • Details


    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


    Plant Type: 
    Shrub Type: 
    Height Category: 
    Garden Height: 
    24 - 36 Inches
    24 - 36 Inches
    24 - 36 Inches
    Flower Colors: 
    Flower Colors: 
    Flower Shade: 
    Pink or Blue
    Foliage Colors: 
    Foliage Shade: 
    Container Role: 

    Plant Needs

    Light Requirement: 
    Part Sun to Sun
    Light Requirement: 

    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: 
    Blooms On: 
    New Wood
    Blooms On: 
    Old Wood
    Bloom Time: 
    Summer through Fall
    Hardiness Zones: 
    5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b
    Water Category: 
    Border Plant
    Cut Flower
    Edging Plant
    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
  • 18 Reviews

    Browse reviews from people who have grown this plant.
    • In its sixth year in my garden, Hydrangea 'Tuff Stuff AHA' hasn't missed a year in bloom. I shape it up in March by cutting the longer stems back to around 12" - 18" and that's all it takes to have blooms all summer. I feed it with Osmocote slow release fertilizer in April. It receives afternoon sun for approximately two - three hours each day.

      Jean Starr
      , Indiana
      , United States
      , 15 weeks ago
    • My tuff stuff ah-ha is doing great in a freeze proof flower pot. I’ve had it for over 3 years. 7b Morning sun only on a covered porch.

      , North Carolina
      , United States
      , 24 weeks ago
    • I grow in England Zone 8a and the older varieties of Hydrangea serrata/macrophylla grow here easily and always bloom no problem. But I can see how this one would be great for a colder climate in the US or Canada as mine suffered a lot of damage from the heatwave of >100°F here in summer 2022. I cut it to the base in late winter to rejuvenate it as it was all uneven from the drought damage and this spring (May 2023) it has grow to about 10” and ever single shoot from the base of the plant has a bloom in bud at the end! Mine bloomed blue with speckles of pink on each lace cap. Definitely grow these varieties if you’re in cold zones!

      Kurt Ilko
      , United Kingdom
      , 27 weeks ago
    • I live in zone 6, I have one of this plant in a pot and it bloomed beautifully last year. I didn't expect it to come back since I left it in the pot outdoors and it is only hardy to zone 5. Surprisingly, it came back this spring and now I have green leaves on all the branches. I can't wait to see all the flowers this summer.

      , Canada
      , 28 weeks ago
    • I bought 2 of these and living on n zone 5 they should be hardy but they aren’t. This hydrangea is supposed to bloom on old and new wood. Both of mine die back all the way to the ground very year. So I get zero blooms on old wood.

      Allen Robertson
      , Ohio
      , United States
      , 29 weeks ago
    • I bought 2 of these and living on n zone 5 they should be hardy but they aren’t. This hydrangea is supposed to bloom on old and new wood. Both of mine die back all the way to the ground very year. So I get zero blooms on old wood.

      Allen Robertson
      , Ohio
      , United States
      , 29 weeks ago
    • Happy Hydrangea, happy owner. I purchased two of these plants. Both are planted on the North side of my house. Neither of them had many blooms when I bought them. The plants looked healthy and that's what mattered. Both are thriving and blooming very well. The one with the most shade is the happiest. The leaves are beautiful and the blooms are stunning. The color is a beautiful light blue.

      Tim Swearingen
      , Virginia
      , United States
      , 1 year ago
    • Purchased a Tuff Stuff Hydrangea in April. There is no growth in 3 months, other than a few very tiny, distorted leaves. The ground cover nearby is taller than this shrub. I believe these were incorrectly sprayed with growth inhibitors at the original nursery. Very disappointing.

      Rebecca Gold
      , Kansas
      , United States
      , 1 year ago
    • I ordered these from PW and, while they arrived in great condition and loaded with flowers, the branches flopped straight down the ground and haven't come up off the ground in the two months since I planted them. This is very disappointing as they look more like ground cover than a shrub.

      , Virginia
      , United States
      , 1 year ago
    • I planted 4 different types of hydrangeas last year, 2 endless summer, 3 standard costco one, 3 PW Mars, and 1 of this AH-Ha- Tuff Stuff. After my other Hydrangeas had wilted and been long gone (endless summer held out too),, this one kept reblooming! I like that it blooms again on new growth, it makes it more hardy if something happens to it over winter like someone breaking a branch etc... My PW Mars plants are beautiful but I baby them and they are slower to grow (still worth it!), this Ah-Ha is pretty strong, I moved it and it is doing well. I was very impressed with this Hydrangea, I've been keeping an eye out for this years shipment at my local nursery but haven't seen it yet! Looking forward to seeing how it does this year being it's 2nd year and changing out the costco ones which have never really bloomed well with this one.

      Tony G.
      , Oregon
      , United States
      , 2 years ago
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