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Home » Gardening » How to Grow & Train Flowering Hydrangea Shrubs into Tree Hydrangeas.

How to Grow & Train Flowering Hydrangea Shrubs into Tree Hydrangeas.

Updated : May 24, 2019

50 Comments

There are a number of different varieties of Hydrangea shrubs that are often grown into tree form.  Many people don’t realize that a Tree Hydrangea is actually a Hydrangea shrub that was simply trained to grow as a flowering tree.  This is also done with Rose of Sharon, I’ve seen it done with Red Twig Dogwood, a number of different viburnums and even Wisteria can be trained to grow as ornamental trees.

The steps to do this are as follows and there’s also a video on this page as well.

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Training Flowering Shrubs into Tree Form.

Training Flowering Shrubs into Tree Form.

In this example I am using a variegated weigela that we just potted up as an example because . . . it’s what I had handy to write this article.  And this plant is a good example of what you are typically starting with when you train a flowering shrub into tree form.

This plant doesn’t look like it would make a nice tree because it has side branches and it has a serious case of “double leader”.  Two stems each competing to grow upright as the main stem of the plant.  To grow this plant into a single stem flowering tree do the following;

1.  Remove one of those double leaders.  In this example they are about equal so which one you remove doesn’t matter.  But at this point remove one and also remove that little stub that at one time was the leader but it was either pruned off or it died back.

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2.  At this point I would only make those two cuts because we need those other side branches to make leaves and feed this plant through photosynthesis until the main leader puts on new growth and leaves.  As that happens and the tree has plenty of leaves coming off the main leader you can remove those lower branches that will eventually detract from the tree.

3.  Never allow any branches that need to be remove get larger than 3/8 of an inch in diameter.  Ideally remove them when they are 1/4″ or about as thick as a pencil.

4.  Using some kind of a plant stake, bamboo or other wise, stake up the main leader and secure it to the stake so it grows nice and straight.  I often use duct tape for this because when the tape is out in the sun it only holds up for about 12 months before the glue dries and the tape falls off.  Other tape might not come off as easily and it will eventually damage the tree.

5.  Allow the main leader to grow straight as a single stem.  If the main leader produces side shoots they will eventually have to be removed, but keep in mind that the tree needs lots of leaves in the early stages so you may want to leave those side shoots temporarily.

6. Early next spring you need to cut the top off of the main leader at the point where you want the branching to begin.  Usually about 30 to 36 inches off the ground is ideal.  Just snip the top off.

7.  The snipping off the terminal bud will force the plant to start putting out lateral branches right below where you make that cut.  Those branches will develop into the head of the tree.

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8.  As the branches that will make up the head of the tree start to develop and produce lots of leaves, you can remove all of the growth (side branches) from the ground to the point where the head of the tree starts.

9.  As the head of the tree grows it’s important to do some trimming so the head grows nice and full and not lanky.  In the video you can see where the trees I am using as examples were trimmed and how much the trees filled out after each pruning.

In the movie I mention One Finger Pruning.  Check it out here.
That’s it!  That’s how you train flowering shrubs like P.G. Hydrangea into Tree Hydrangeas.

And here’s a new video on Growing Tree Hydrangeas.

YouTube video

You can easily propagate hydrangeas from cuttings.  See this technique for doing them during the summer as softwood cuttings and this technique for doing them in the winter as hardwood cuttings.

.Questions, comments, mean things to say?   Post them below.

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Comments

  1. Natalia Tran says

    October 13, 2020 at 11:07 am

    I recently purchased an oakleaf hydrangea that I wanted to train into a tree, however, the two branches it does have are heavily bowed and certainly not straight in any way with the top of the main stem being cut Off bat I figure that these two main branches will not be a good candidate as main stems. Would that be a correct assessment?
    I’d assume I’d have to wait till next year’s new growth to choose a new main branch to stake. If that’s correct, how soon should I wait to cut the other two branches? Thanks!

    Reply
    • Mike says

      October 14, 2020 at 6:37 am

      Natalia,

      At this point I’d try and stake one of the stems you have. Or in the fall cut the plant back and select a new stem in the spring/summer. Stick the cuttings that you remove from the plant in the fall. https://mikesbackyardnursery.com/2015/01/easy-winter-time-plant-propagation-can-home/

      and this; https://mikesbackyardnursery.com/2016/09/hardwood-cuttings-winter-of-20152016/

      Reply
  2. Jenee says

    August 2, 2020 at 7:55 pm

    I made a mistake in my attempt at pruning a little lime hydrangea bush into a tree. I chose the straightest stem from my new hydrangea plant and removed the rest of the branches. And once I started staking The Stem, I realized that the tip of the stem was already pruned off! I wanted the plant to get much taller though. So I was wondering if I could salvage it. . There are two branches on the sides of the pruned-off stem tip. Could I stake one of the branches and encourage it to be a continuation of The Stem . . And hopefully a strong trunk?

    Reply
    • Mike says

      August 4, 2020 at 8:43 am

      Jenee,

      Sure, just train one of those other branches to become the main leader. It will turn out fine.

      Reply
  3. Melissa says

    May 28, 2020 at 8:45 pm

    I’m pruning a few hydrangeas into trees. I’m wondering if I have to worry about a leader branch? There is a little tiny branch in the middle of one that isn’t producing any growth. I want the main stem to be longer.from base to the branches. Right now it is only about 20 or so inches. Suggestions?

    Reply
    • Mike says

      May 29, 2020 at 7:46 am

      Do not cut the tip of that leader, just allow it to grow and keep it staked. At 42 to 48 inches cut the tip so it branches out.

      Reply
  4. Karen says

    June 2, 2019 at 12:09 pm

    Hi Mike, I had a beautiful hydrangea tree that’s about 5’ tall and the trunk is about 2in diameter. It died this past year and the branches are hollow and dead. However, there are a bunch of new growth coming from the base this May. Is it possible to take one of those and create a new tree?

    Reply
    • Mike says

      June 3, 2019 at 8:22 am

      Karen,

      Yes, I believe it is possible, just remove everything else.

      Reply
      • Anonymous says

        June 3, 2019 at 6:53 pm

        Thanks. I’ll let you know how it works out.

        Reply
      • Karen says

        June 3, 2019 at 6:54 pm

        Thanks. I’ll let you know how it works out.

        Reply
  5. Anonymous says

    December 29, 2018 at 2:34 pm

    My kids

    Reply
  6. Frank V says

    July 30, 2018 at 11:47 am

    Hi Mike,

    is it possible to do any of these procedures on a few year old tree? My current crape myrtle is about 3-4 years old but only about 3 feet tall. from the base of the plant, there are 3 main stems (with no side growth), which grow about 28-30 inches before they break out horizontally. Can i just prune off the 2 side branches, and let the middle one grow straight up?

    Reply
    • Mike says

      July 31, 2018 at 7:54 am

      Frank,

      Yes, you should be able to do that.

      Reply
      • Frank says

        July 31, 2018 at 4:15 pm

        Great, thanks. And what season is best to move this plant from one part of my yard to another? (live on Long Island NY)

        Reply
        • Mike says

          August 1, 2018 at 8:07 am

          Frank,

          Transplanting season begins after Thanksgiving and ends in early to mid April in the north.

          Reply
  7. Jill says

    June 2, 2018 at 6:51 pm

    Hi Mike, are there any climbing hydrangeas that have a Mophead flower. If no, is it possible to graft a Mophead onto a climbing hydrangea? Thanks

    Reply
    • Mike says

      June 3, 2018 at 11:48 am

      Jill,
      I have no idea but if the graft took it would likely fail the first winter.

      Reply
  8. Stephanie says

    October 9, 2017 at 12:43 pm

    Hi Mike! I just bought a hydrangea bush with the intent to train it to become a tree. It has one nice vertical and a few side growths (which I already cut off). The remaining stem has leaves and a flower on top. Should I cut the flower off now or wait until spring? How far below the flower should I cut?

    Reply
    • Mike says

      October 10, 2017 at 7:46 am

      Stephanie,

      You can remove that flower at any time, just cut down to the node right below the flower. Come spring start training one leader from that point to the height that you want.

      Reply
    • Dominick DeStefano says

      June 13, 2019 at 3:04 pm

      Hi Mike
      I’m just starting to grow a few limelight’s to train into trees. I want to grow them into 7-8 foot tall barrier tree. After your great video, I now know how to trim it to get a main leader into a tree trunk and so forth, however, when should I trim the top to reach my desired height? Should it reach 8’ ? Or about 5-6’ then the branches grow out ward and upward to create a “canopy”?
      Also, how long will this take? There about 2 weeks old – 8-10 inches tall.

      Thanks

      Reply
      • Mike says

        June 14, 2019 at 8:14 am

        Dominick,

        Cut the main leader at about 60″ if you want them that tall. This will take about 4 years to get a really nice tree. Keep in mind, Limelight Hydrangea is still under patent and will be for a few years. The name is trademarked so the name is pretty much protected forever. You cannot use it.

        Reply
  9. ELSA says

    July 29, 2017 at 9:33 pm

    I just recently purchased a hydrangea bush that I would like to turn into a tree. It probably has 6 or 7 shoots and blossoms on it. It’s only been in the ground a day, is it too late to prune off some of those branches and start it growing with one stock?

    Reply
    • Mike says

      July 30, 2017 at 9:55 am

      Elsa,
      Absolutely not, you should be able to prune it into tree form as long as the remaining stem has plenty of leaves on it. If not, just remove a few stems at a time.

      Reply
      • Elsa says

        July 30, 2017 at 10:49 am

        Should I wait until fall? Or do you think it’s ok it do it now?

        Reply
        • Mike says

          July 30, 2017 at 4:08 pm

          Elsa,

          Fall would be better.

          Reply
  10. Caren says

    April 8, 2017 at 12:22 pm

    Hi Mike,
    My town has a free tree giveaway every year (awesome, right?), and this year the selection included phantom hydrangeas. My husband went down to get 2 for us, and only then did we realize that they had been trained into tree form. They won’t work for what we had planned. Is it possible to train a tree hydrangea back to bush form?

    Reply
    • Mike says

      April 9, 2017 at 8:39 am

      Caren,

      Sure is. If the trees are still dormant simply cut them down to about 10″ and they’ll bush out from there. If not dormant I’d plant them and usually they’ll try and send out shoots down low and from the bottom. Let those grow then eventually remove the tall stem from down low. But don’t do that until the plant has lots of other leaves that will be left after pruning.

      Reply
  11. Sahari says

    August 4, 2016 at 11:30 pm

    HI Mike, loved the video, thanks. I have a mock orange that I rescued (scraggly as all get out), but doing GREAT in a container with regular watering — pushing out big beautiful leaves. And best of all, pushed out a brand new, straight UP shoot, which I will use for the ‘trunk’. Not sure what to do with the leaves on the ‘trunk’ after I prune for branching — leave them until the branching happens?

    Also, you mentioned in the video to keep lower branches for photosynthesis benefit, but in my case the plant was many years left to the elements in a small pot so the starting points for all the branches are not young and tender and I worry about shocking the plant if I cut it all back except for the ‘trunk’ shoot (which is just over 2 feet now).

    Thanks for any comments you’d like to offer.

    Reply
    • Mike says

      August 5, 2016 at 7:47 am

      Sahari,

      Yes, leave the lower leaves until branching starts to happen, then once you have ample leaves up top, remove all lower growth.

      Reply
  12. Rachael Lemmon says

    July 14, 2016 at 8:02 pm

    I picked up eight limelight hydrangea on clearance today, 3 gallon nursery pots for a steal of a deal. Most of them are for a hedge I plan so that’s fine. But one of them pretty much has one main stem that’s about three feet high , naturally the stem has already flowered as these are fully grown out shrubs. Is there any way for me to train this one as a standard? In this late stage? As a shrub I’d have to cut it back to the ground, it really has no other branches except very spindly ones about 3 inches from the dirt in the pot. If I could post a photo I would. Thanks for any response.

    Reply
    • Mike says

      July 15, 2016 at 8:39 am

      Rachael,

      Just stake up that one stem to make it straight, then come early winter remove all the other branches. Next spring train the plant as described here.

      Reply
  13. Melanie Gorman says

    April 20, 2015 at 9:46 pm

    I took your advice about wheelbarrows last year, a year after back surgery. Although I was not supposed to be using it at all, I found that I was able to move light loads using this tip…and with no ill affects! Other than getting the work done! Thanks, Mike! I read and watch about everything you write and create…and much of it has found its way into my gardening routine. Looking forward to a Mantis tiller this year but finances are tight so it may be next year. Thanks again for all you do for us .

    Reply
    • Mike says

      April 21, 2015 at 8:06 am

      Melanie,

      I so wish others would pay attention to these wheelbarrow tips. They make a huge difference.

      Reply
      • Tess says

        April 26, 2016 at 7:13 pm

        Hi Mike! Can you repost the wheelbarrow tip? I’ve had rotator cuff surgery and need all the help I can get asap. thanks! : )

        Reply
        • Mike says

          April 27, 2016 at 6:51 am

          Tess, here it is. https://mikesbackyardnursery.com/2013/05/wheelbarrow-review-which-wheelbarrow-should-you-or-i-buy/

          Reply
  14. Grace says

    October 10, 2014 at 3:21 pm

    I have beautiful hydrangea plants that don’t bloom. I know not to cut off old wood but what do I do for them to bloom?

    Reply
    • Mary Kilpatrick says

      April 27, 2016 at 6:34 pm

      i have the same problem been here two years and they grow full but no buds or flowers

      Reply
      • Mike says

        April 27, 2016 at 7:35 pm

        Mary,

        Some hydrangeas bloom better than others, you just have to be patient. Macrophylla hydrangea flower buds have to survive the winter and if it’s a bad winter they don’t make it.

        Reply
  15. Sharon says

    September 30, 2014 at 2:25 pm

    Mike, do you carry Snowball Hydrangeas at your Nursery and can anyone come and buy them?

    Reply
  16. Pat Leuthauser says

    September 11, 2014 at 5:24 pm

    Mike, my pg hydranga is probably 4 feet high and is more like a bush. With the humid weather this summer they have huge flowers which almost bring the boughs down to the ground. I have never tried to prune it except to cut out the dead. Is it too late to prune into a tree? It’s expanded into the chain link fence and I thought that might raise it up? It looks so crowded!

    Reply
  17. Jan says

    May 8, 2014 at 3:16 pm

    Mike I just planted 2 varigated lacecap hydrangeas. the weather just went from the 70’s to the 90’s and my plants are very wilted. They get sun from early morning to early afternoon, then are shaded the rest of the day. I’m afraid I may overwater trying to get them to perk back up. Any suggestions on what I should do?

    Reply
    • Mike says

      May 11, 2014 at 8:54 am

      Jan,

      Water as needed but don’t make the ground soggy. Rig up some portable shade over them. A tarp over two old chairs works.

      Reply
  18. Kathy STORM says

    May 6, 2014 at 11:02 am

    Mike, I have 2 gardenias, one mini and one regular size flower, that have suffered winter damage. White Fly have plagued them for the last few summers, resulting in the black soot on the leaves. Both plats look pathetic this spring, and even the stems are covered with the black soot yuk!!!! I’ve washed the leaves in the past, but that has not proved o be a long lasting benefit. Any suggestions?

    Reply
    • Mike says

      May 7, 2014 at 7:33 pm

      Kathy, see this http://pender.ces.ncsu.edu/2013/05/how-do-i-treat-whitefly-on-gardenia/

      Reply
  19. Kenneth Kohl says

    May 4, 2014 at 8:15 am

    Hello Mike…I am learning about trees and shrubs and everything in between.. I have some azalias out front and they aren’t blooming yet. I live in N. Ga. area, frost clear. I do have a green thumb, I’m not sure how to prune. I liked this video about beginning trees

    Reply
    • Mike says

      May 4, 2014 at 11:07 am

      Keeneth, Ideally prune your azaleas right after they bloom, just prune them to give them uniform shape. They can be trimmed at any time, but right after flowering is the ideal time.

      Reply
  20. Grace Hull says

    April 27, 2014 at 4:03 am

    Thanks Mike! I Love gardening and I love doing the lolly popping the trees, but the hydrangeas? I never thought of that! Thanks for sharing your knowledge! I am doing more to fund raise for my charity work for Milne Bay, Papua New Guinea. I think, with your knowledgeable help, I will do well! I will keep you posted when I make my first $100.00AUD in a day!

    Reply
  21. Rita Griebel says

    April 23, 2014 at 12:16 pm

    How do I tell which hydrangdea I have? Bought at a action a few years ago. grows upwards to 3 feet tall and has may branches from bottom of plant. Could I cut off branches and start new bushes and then make them into a tree hydrangdea

    Reply
    • Mike says

      April 24, 2014 at 5:28 pm

      Rita,

      You can root them like this http://www.freeplants.com/homemade-plant-propagation.htm, then try training them into trees. Macrophyllas like Nikko Blue and Endless Summer don’t work well as trees. The white flowering varieties make nice trees.

      Reply
  22. Teresa Grippe says

    April 22, 2014 at 10:44 am

    Thanks for the info. I have been gardening since I was 7 and now I am 52. This was one piece of info I can use and put in my personal memoirs. I am now getting ready to separate a delicate tree hibiscus that my mother in law says is rare variety. I believe there is about 9 plants in it now, wish me luck.

    Reply

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