The Truth About ‘Endless Summer’ Hydrangea

September 3, 2009 | By | Comments (22)

Anyone who planted ‘Endless Summer’ hydrangea in the last 5 years has a love-hate relationship with this plant. They either love the fact that they can now enjoy hydrangea blooms in their garden for the first time. Or they hate it because this vaunted plant never lived up to its hype.



You’re looking at a bloom on my ‘Endless Summer’ hydrangea. It opened up just this week. This marks the first time any of my three ‘Endless Summer’s have ever produced a bloom later than June. Not exactly what I was told to expect.

You remember the hype about ‘Endless Summer,’ don’t you? Here was a hydrangea that bloomed all summer long on both old and new growth. That “old and new” factor made a big difference. It meant that even if severe winter cold killed the plant (and its dormant flower buds) to the ground, it could still grow the next year and produce flowers. So Northerners so jealous of these gorgeous blue blossoms could finally enjoy the beauty that we Southerners know every June.

By and large, Northerners loved it. I scoured blogs and posts from gardeners all across the Upper Midwest and even Rocky Mountain states and many were wildly enthusiastic. They weren’t getting repeat blooms, mind you. They were thrilled at just seeing blooms at all.

Down South, the reviews were less positive. Most people I talked to had the pretty same experience as I. ‘Endless Summer’ bloomed beautifully on both old and new wood until the end of June. Then when it got hot and dry, the way it most always does down here, the plant entered suspended animation and never produced another blossom.

How could this be? Well, you have to know something about the history of the plant. ‘Endless Summer’ was developed by Minnesota’s Bailey Nurseries in collaboration with renowned woody plant guru, Michael Dirr. Walking through Bailey’s planting fields, Mike noticed an unusual specimen of Hydrangea macrophylla that bloomed not only on old growth, as most do, but on new growth too. And so ‘Endless Summer’ (the best marketing name for a plant ever bestowed) came to be. Bailey was just as shrewd about the pots for ‘Endless Summer.’ They wouldn’t be ugly black, like 99% of nursery pots are. No, they would be bright blue, the same color as the flowers. As soon as the first ‘Endless Summer’s arrived, they literally flew out of garden centers all over the country.

Now Mike and Bailey are smart people. I don’t think they’d put their names behind something that wouldn’t produce as advertised. So what exactly went wrong?

Well, let’s pretend you’re an ‘Endless Summer’ hydrangea growing in a pretty blue pot at Bailey Nurseries. Life is good. Every day, you get just the right amount of water and fertilizer to keep you in optimal condition. So you grow all through the summer, repeatedly producing new flowers.

Now you get planted in my yard in Alabama. Spring is nice, no freezing weather to nip you in the bud (what a great pun), and rainfall is plentiful. So you bloom like crazy from late May through June.

Then something awful happens. July arrives. It gets hot. Because you have lots of big leaves, you transpire a lot of moisture. You are always thirsty. But the mean, old Grump won’t water you every day. Why, sometimes when he gets home from work, you’re already wilting! Does he notice? No. He goes into the house and pops open a beer. Oh, very nice. Glad someone’s getting a drink!

You decide to get even. After two weeks of hot, dry weather, you decide to hibernate. Oh, you’ll keep your pretty green leaves all summer. But no matter what the Grump does from then on, you won’t bloom again. Nosiree. You’ve shut down for the summer.

So why did mine repeat bloom for the first time this summer? Credit our wacky weather. Instead of our usual summer drought, we’ve had steady rain all July and August. Plus, this has been the coolest summer in Alabama I can remember. Last evening, out on our deck, it was 72 degrees! The high for the day was 78. That’s at least 10-12 degrees below normal. So ‘Endless Summer’ didn’t go dormant. Thinking it was growing in Martha’s garden on Long Island, it finally produced a second round of blooms. Yippee!

So do you need Global Cooling to get repeat blooms on “Endless Summer’? Not necessarily. Try planting it in a container. People customarily water and feed plants in containers much more often than those in the ground. Under these conditions, ‘Endless Summer’ should think it’s right back at Bailey Nurseries in Minnesota and bloom throughout the summer.

One final note. ‘Endless Summer’ may not be the panacea Northerners had been hoping for after all. In Cold Climate Gardening, blogger Kathy Purdy in upstate New York reports a rather dismal performance due to late spring frosts that damage leaves and buds and cool summer temps that inhibit flower production. Oh well. Guess she’ll have to settle for those blue plastic hydrangea blooms from Wal-Mart after all.


  1. Pamela Trusheiim

    I live in zone 8 in central GA. If I had read The Truth About ‘Endless Summer’ Hydrangeas earlier, I never would have purchased them. I know we had an early spring frost that lasted 3 nights, but all 6 of them have wonder green leaves but no buds. The various other varieties I have are blooming now. All have been fertilized. I am giving Pike Nurseries a copy of the article; maybe they will not sell them after reading the article. It is July 13, 2017. Pamela

    June 13, 2017 at 2:20 pm
  2. Shirley

    How often do you all fertilize endless summers?

    June 4, 2017 at 5:48 pm
  3. amberkayphoto

    I’m truly confused. I live in the Florida Panhandle and have 13 ES hydrangeas as foundation plantings. It’s not even May and I’ve got several plants (the ones on the East side) that have 3-5 blooms on them. Even my plants that are North-facing and shaded by the house are budding up, they’re just a week or two behind the ones that get more sun. I keep waiting for them to not amaze me because of how they do supposedly so horribly in the South. Mine are in sand on one side, clay on the other. I water pretty much every day in the summer… Not sure how I got lucky, the plants even came in two separate shipments from our nursery.

    April 25, 2017 at 5:06 pm
  4. Mary

    I have 3 endless summer hydrangeas that have never bloomed since they were been planted by a landscap company I hired 8 years ago in the front yard garden bed next to the house which faces north. I moved them last year to a garden on the west side of the house thinking they needed more sunlight and still no blooms. This will be my last try and if they don’t bloom this year I will dig them up and put them in my compost bin. This plant should have been named the never blooming hydrangea.

    Very disappointed

    April 18, 2017 at 1:02 pm
  5. Carol

    Thanks Grumpy gardener for the heads up on endless blooms. I’ve had great progress with blue hydrangeas when I lived in PA. But I now live in NW New York and am going to plant blue hydrangeas here. My successful plants were planted in a garden that was once a vegetable cow manure garden. I think that’s why they were successful. I bought them at Whole Foods too. So I might just stick to that plan here in New York. Thanks for the heads up. Very helpful.

    March 23, 2017 at 11:26 am
  6. jrogrows

    jro grows

    I entered a post on June 25,2016. In it I mentioned that I had purchased the “Bloomstruck” Endless Summer and that it was absolutely loaded with buds. I put this $17 plant from Menards into a large container with some excellent potting mix. It grew and grew but those buds would not bloom. Then I read somewhere that plants need PHOSPHORUS to bloom well.. So I added some Miracle Grow Bloom Booster (a fertilizer that you dilute with water and then apply). It has a high phosphorus content. (You could use any fertilizer that is high in phosphorus.)
    Well that did the trick. In approximately 2 weeks all those buds began opening and oh my, they are the most amazingly beautiful deep pink color (2 shades of deep pink). They are a very different pink compared to the “Original” Endless Summer varieties that I bought back in 2013. The only way to describe them is astoundingly beautiful. Large, full complete round and perfect balls of beauty. And they do not die. I did remove 2-3 that deteriorated but all the rest have just continued to be perfect. It is unbelievable. These big round deep pink balls of beauty have been on the plant (in a container I might add) for over 2 months now and look as good as they did the day they opened up. It is now Oct. 8 and we had a light frost last night. I covered the plant and it is just as good as ever. No damage what so ever to any part of the plant. It got down to about 34 to 36 degrees and you would never know this looking at this plant.
    It is amazing to me that these “balls of beauty” can bloom and stay stable for over 2 months. Oh my goodness, talk about “plant love”. I look at them all the time and continue to enjoy, enjoy, enjoy. Thanks to the Menards store in Coon Rapids, Minnesota (off of Main Street) for selling such amazing plants. I buy most of my plants there every years and have gotten excellent plants, containers and potting mix all at bargain price. And again thanks to Baileys Nursery for developing this Endless Summer hydrangea.

    October 8, 2016 at 8:49 pm
  7. What’s Wrong With My Hydrangea? | Southern Living Blog

    […] “The Truth About ‘Endless Summer’ Hydrangea” […]

    August 14, 2016 at 10:05 am
  8. Carolyn Siebels

    I just go several Endless Summer hydrangea plants in a pot and are wondering if I can cut them for a bouquet without hurting the plant.

    July 1, 2016 at 4:26 pm
  9. jro grows

    I live in the outer northern suburban area of Minneapolis, Minn. Three years ago (June 2013) I purchased 4 of the Endless Summer Hydrangeas in the blue containers at Menards in Coon Rapids for $13.88 each (on sale). I have never found them this cheap again.
    They have performed EXCELLENTLY. I would say ABSOLUTELY AMAZING! The first year they bloomed abundantly right in the original containers before I even had a chance to get them into larger containers. And I tell you the blue color was GORGEOUS. I did place them in large containers (at least 18-20 inch diameter) with amended potting mix as recommended on various web sites.
    I placed them in an area where they get afternoon sun for about 6-7 hours with a one hour break midway from a small tree. (The literature says that they do best with morning sun and afternoon shade-I was not able to provide these conditions.) They do require ALOT of watering-don’t let them get dry.
    Now for the third year they are again producing large numbers of amazing blooms that just seem to keep growing larger all summer long. Some get absolutely HUGE. The foliage is absolutey thick and sturdy and dark green. These are incredibly beautiful plants, I could not be more pleased with their performance. Extreme beauty all summer long until the hard freeze.
    I overwinter them in their containers in a garage that probably does not go below 0 degrees fahrenheit. They are sooooo easy to maintain. Use a good quality potting soil. I use the Master Gardener flower and garden variety from Menards (it works great in containers). Add your used coffee grounds to the top soil to help acidify the soil for the blue blooms, add a bit of lime to the soil for pink blooms. Read up as much as you can in the computer on various web sites for care and soil amendments. And WATER WATER WATER.
    I love these plants. This year I purchased a “Bloomstruck” Endless Summer variety and it is LOADED with buds. Menards had them for $20. originally and then marked them down to $17. A terrific value for years of great beauty.
    Thank you so much to Baileys nursery in Minnesota.

    June 25, 2016 at 9:28 am
  10. Tom Knapp

    If anyone wants to take a look, check out my facebook page. Im going to post a picture of it later today.

    June 20, 2016 at 3:46 pm
  11. Tom Knapp

    Im fairly certain that I have one of these growing in northern Palm Beach County, FL.
    Its middle of June, and this beauty has no problem with the heat. I pirated this guy out of my neighbors yard when he re landscaped his old house. He had no idea what it was. Looked like a Hydrangea to me but we both figured it couldn’t be. Cant figure out how to post a picture on this site.

    June 20, 2016 at 3:44 pm
  12. Laura

    Oh my ladies, I just bought 3 every pricy (insanely, online orders only) Endless Summers from HD, and they will arrive next week. We live in a moderately dry So Ca micro climate, and I am planting them around our front yard facing chimney, that has brick imperfections on the bottom (2 ft up from the ground). The house faces north, and we get morning shade and then 4 hours of sun mid-afternoon. I’ll plant them in a container until they mature to a larger size. Anyone know the annual growth rate of ES? (You ladies are funny. Cyberhugs)

    June 16, 2016 at 8:38 pm
  13. Laura

    Thank you for this explanation. I live in NJ and call my non-blooming plants “Endless Frustration”.

    June 3, 2016 at 5:23 am
  14. Jemmie

    Greetings, it’s 2015, zone 5 (southern Mivhigam living…..)

    And the wettestt summer! It’s like the Pacific Northwest. And my 32 Endlrss Summer hyd have jurassic blooms. I’m trying to etch this in my visual memory. Bowling ball size blooms.

    Note that we had a couple weeks of 10below zero temps this winter. so please don’t begrudge me this beauty
    And marvel at the tenacity.

    July 21, 2015 at 11:15 pm
  15. Roz Behan

    I live in Sugar Hill Georgia in my hy ranges are right by my rain barrel and they get plenty of water last year they didn’t bloom at all but I think that was the Awful winter and hot spring.

    but daddy anymore it will be the old fashioned ones because I think when I see them on other peoples gardens are much prettier a lot more flowers and they that blooms on them till fall

    April 21, 2015 at 3:10 pm
  16. Jean

    Nursery friend gave me one last year. It was blooming…now this year NO blooms nor did hers bloom either. Whats up with that? The Grump should be out early watering along with the rest of us crazies.

    September 4, 2009 at 9:50 am
  17. Grumpy Gardener aka His Excellency

    Grumpy answers:
    Ilona — The color of the flower depends on the pH of the soil. My soil is quite acid, so I get very blue flowers. In near neutral soil, the bloom is pale blue. In alkaline soil, the bloom turns pink.
    Florida Gardener — I’ve never seen a single ‘Endless Summer’ in south Florida. Guess there’s a good reason.
    Nancy — Pleased with your results. Has Tampa had plenty of rain this year?
    Beth — For the benefit of readers, Shelby County is very close to where the Grump lives (about a mile down the road). So your experience this year mirrors mine. Cut off the old blooms, keep the thing watered, and maybe with this crazy cool weather, you’ll get more blooms.

    September 4, 2009 at 7:46 am
  18. Beth @ Unskinny Boppy

    Mine is blooming too!! Right here in Shelby county. It’s been in the ground for going on four years, and this is the first year I remember it blooming this late. I actually made a mental note as I was pulling out of my driveway this morning that I needed to take a picture to document that it was reblooming.
    So, now’s the time when I should cut off all the old dried up blooms that are surrounding the new one, right?
    PS– you crack me up so much. I love reading this blog.

    September 3, 2009 at 10:47 pm
  19. Nancy

    I’ve had an Endless Summer in Tampa for 2 yrs. First yr. was in a pot and did ok, with blooms through the summer but not much growth. I put it in the ground this year in a place with morning shade. It has done well and is still blooming. I did notice that it wilts easily down here, but we’ve either had enought rain or I’ve watered enough to keep it blooming.

    September 3, 2009 at 10:13 pm
  20. FloridaGardener

    They sent three plants for me to test in South Florida. No go, they all died by June! They should have known better, I did.

    September 3, 2009 at 8:12 pm
  21. Ilona

    I love the photo- that is what it is supposed to look like:)
    This year I had the first bloom on hydrangea mariesii, but endless summer does well for me, just without the blue hue. I’ve noticed it in Columbus Ohio yards, and it seems to be doing well here generally.
    It is quite a wilter when the summer dries out, though.

    September 3, 2009 at 3:26 pm
  22. Kathy from Cold Climate Gardening

    Like I said, it’s a Goldilocks plant. It wants it not too hot, not too cold, not too wet, not too dry: j-u-u-u-ust right. The gardeners who love these plants the most live in the mythical average North American climate, and live to water and fertilize. It still reminds me of my grandma’s hydrangeas (she lived on Long Island, too) but one year practicality will win out over sentimentality, and ‘Endless Summer’ will enter the winter of its discontent.

    September 3, 2009 at 2:01 pm

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