Ask a Question forum→Endless Summer Bloomstruck Hydrangea in Zone 4?

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Minneapolis Minnesota (Zone 4b)
May 23, 2020 7:00 AM CST
We have three Endless Summer Bloomstruck Hydrangeas planted and they keep dyeing back each winter... then growing SO slowly in the spring. We planted them spaced apart based on a 4-5' shrub, but these struggle to grow to a full foot. This is the third season.

Our Flaming Spirea and Lava Lamp Moonrock Hydrangea are doing great right near by. The Flaming Spirea dye back to the ground every year but they are half way grown already and they are beautiful during their growth phase. Is there anything we can do to get these growing? Or is it best to cut our losses and find another plant?
Name: Rj
Just S of the twin cities of M (Zone 4b)
Garden Ideas: Level 1 Plant Identifier Million Pollinator Garden Challenge
May 23, 2020 9:08 AM CST
Welcome to the site!

I've had the Endless Summer since it was first released to the public 20+ years, it blooms on old and new growth, I don't prune it until first weeks in June. It likes 4-6 hours of sun, the blooms are very sporadic for me. At my sisters home in Z7b, the plant blooms prolifically and grows 5-6 feet, having said all of that, I would move on to a more reliable shrub.
Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed.
Name: Rick R.
Minneapolis, MN, USA zone 4
I was one of the first 300 contributors to the plant database! Garden Sages The WITWIT Badge Garden Photography Region: Minnesota Hybridizer
Seed Starter Plant Identifier Million Pollinator Garden Challenge
May 23, 2020 2:53 PM CST
Though hardy in the Twin Cities here, that type of hydrangea is somewhat finicky. It is normal for them to die back in winter, it seems usually to 4-10 inches. If you have the right place for it, it will do fine on its own, but if not, few people are able to nurse it to good growth. I would move on, also.
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Name: Luis
Hurst, TX, U.S.A. (Zone 8a)
Dog Lover Region: Texas Salvias Roses Hibiscus Plumerias
May 25, 2020 3:21 AM CST
I would not expect it to get too tall in z4. Winter will kill all the stems but it will develop new stems in Spring. Just as the new stems get tall, the growing season is over, winter arrives, kills the stems and the process starts again.I

To protect the sgems, you would have to winter protect the plants.

Or switch to Annabelle-like hydrangeas or add more hydrangea paniculatas like Bobo, Little Lime, Little QF (Quickfire) or Strawberry Sundae. These bloom on new wood and are more bloom hardy and winter hardy.
[Last edited by luis_pr - May 25, 2020 3:47 AM (+)]
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Minneapolis Minnesota (Zone 4b)
May 25, 2020 7:24 AM CST
Thanks a lot for the replies!! I'll be replacing them next spring.

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