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Avatar for Jim_MN
May 23, 2020 7:00 AM CST
Thread OP
Minneapolis Minnesota (Zone 4b)
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?
May 23, 2020 9:08 AM CST
Name: Rj
Just S of the twin cities of M (Zone 4b)
Forum moderator Million Pollinator Garden Challenge Plant Identifier Garden Ideas: Level 1
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.
As Yogi Berra said, “It's tough to make predictions, especially about the future.”
May 23, 2020 2:53 PM CST
Name: Rick R.
Minneapolis,MN, USA z4b,Dfb/a
Garden Photography The WITWIT Badge Seed Starter Wild Plant Hunter Region: Minnesota Hybridizer
Garden Sages I was one of the first 300 contributors to the plant database! Plant Identifier Million Pollinator Garden Challenge
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.
When the debate is lost, slander becomes the tool of the losers. - Socrates
Avatar for luis_pr
May 25, 2020 3:21 AM CST
Name: Luis
Hurst, TX, U.S.A. (Zone 8a)
Azaleas Salvias Roses Plumerias Region: Northeast US Region: New Hampshire
Hydrangeas Hibiscus Region: Georgia Region: Florida Dog Lover Region: Texas
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 Icon for preview
Avatar for Jim_MN
May 25, 2020 7:24 AM CST
Thread OP
Minneapolis Minnesota (Zone 4b)
Thanks a lot for the replies!! I'll be replacing them next spring.
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