Pruning Hydrangeas
Knowing if your shrub blooms on old or new wood will help you make timely cuts
I know people are confused about how to prune hydrangeas because I get asked about it all the time. The three most common reasons for their confusion are the plant’s dead-looking appearance in winter, its failure to bloom in summer, and the reasoning that because it’s a shrub it needs to be pruned. But these popular woody plants can live long, floriferous lives without ever feeling the cold blade of a pair of Felcos. Hydrangeas, though, can handle pruning (which, if done at the wrong time, may be the cause for the lack of flowers), and sometimes you might want or need to cut them back a bit. For example, you may not like the look of the fading blooms, or your shrub may be a bit too tall. Pruning hydrangeas can also improve a shrub’s vigor and increase the size of its flowers.
Not all of these shrubs should be pruned at the same time. Those that bloom on old growth should only be pruned after flowering. Others bloom on new growth and should be pruned before they wake up in spring or as they are going dormant in fall.
More on hydrangeas and pruning:
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Hydrangeas that bloom on old wood
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- Bigleaf hydrangeas (Hydrangea macrophylla cvs., USDA Hardiness Zones 6–9)
- Bigleaf hydrangeas (H. serrata cvs., Zones 6–9)
- Oakleaf hydrangeas (H. quercifolia cvs., Zones 5–9)
Prune after the flowers start to fade in late summer
To determine if your hydrangea blooms on old wood, think about when it flowers. Shrubs with this characteristic generally begin blooming in early summer and peter out by midsummer, though sporadic blooms may appear afterward. These shrubs form next year’s flower buds in late summer or early fall as the days get shorter and temperatures cool off. To reduce the risk of removing these buds, prune just as the flowers begin to fade. Often, the earlier you get it done after bloom, the quicker the shrub can recover, producing more and larger blooms next season.
1. To tidy up, remove old blooms
Gardeners who want to maintain a tidy appearance can snip off spent blooms just below the flower head and remove any wayward or straggly canes at the soil line.
2. To improve vigor, remove the oldest canes
When a hydrangea gets old and woody, it can produce smaller blooms. Regular removal of a few of the oldest canes at the soil line can keep the shrub vigorous, producing large and abundant flowers. The same method can keep a shrub from getting too tall by targeting the tallest canes for removal.
Watch a video on pruning bigleaf hydrangeas
If you do decide you need to prune your bigleaf hydrangea, this video will give you the information you need to time your cuts correctly and identify where to make them on the shrub. The only tools you will need are hand pruners and perhaps a pair of loppers to reach down into the hydrangea. Also, be sure to wear some safety glasses. You might not think they are cool, but it is very easy to poke your eye on a stem as you are trying to see down into the shrub. And a poke in the eye is never cool.
So stay safe, time it right, and enjoy your shrub.
Hydrangeas that bloom on new wood
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- Panicle hydrangeas (H. paniculata and cvs., Zones 4–8)
- Smooth hydrangeas (H. arborescens and cvs., Zones 4–9)
Cut back these shrubs in late winter before new growth begins
Because they need to grow and set buds the same year that they bloom, shrubs that flower on new wood generally start blossoming later than old-growth bloomers, beginning in midsummer and continuing until the first frost. These shrubs are forgiving if pruning is not done at a certain time as long as you avoid pruning when the flower buds are opening.
1. To get bigger flowers, cut them all the way back
In late winter or early spring, these shrubs can be cut all the way back to the ground. Smooth hydrangeas will produce much larger blooms if pruned hard like this each year, but many gardeners opt for smaller blooms on sturdier stems.
2. To reduce flopping, leave a framework of old growth
Some hydrangeas’ branches often fall over under the weight of their blooms, especially after overhead irrigation or after a good rain. One way to alleviate this flopping is to cut the stems to a height of 18 to 24 inches to provide a sturdy framework to support new growth.
—Janet Carson is the horticulture specialist for the University of Arkansas Cooperative Extension Service.
Photos, except where noted: Steve Aitken
Illustrations: Chuck Lockhart
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Comments
We had blooms here in Seattle as late as October. We have now had a frost and they are dead. One week beautiful blooms and the next brown. I assume I need to cut them now? They are all big leaf hydrangeas.
Prune in spring and enjoy the flower heads in winter, they are also a safe warm place for the insects.
Different hydrangeas need pruning at different times as depending on the type, some don't really need pruning while others can be pruned hard to near ground level. This website has some detailed information in pruning which may help. http://www.hydrangeaguide.com/pruning-hydrangeas/
Riccardo our hydranbgeas plants were not pruned back after they bloomed. I will take your advice above an prune them when winter is almost over which is soon here in the midsouth. How close to the ground should I cut back the old wood. Thanks
The Grounds keeper at our apartment complex cut my nikko hydrangeas all the way back...? will they come back this year and will they bloom? I just about died when I saw what they did.
Please let me know what happens. .We had a similar experience and my 12 year old son d pruned our Annabelle hydrangeas severely, , in a good- hearted but perhaps misguided effort to get a more trimmed and neatened appearance.. There are a fair of branches cut to the ground!
Suffice it to say they did not bloom this year.. I told the head of the grounds keepers to put in his notes for next year to not touch my hydrangeas...grrrr ..when they are in bloom they are gorgeous. .
Ours bloom early because of the heat here in southern Italy. Last year I pruned after they flowered and we have had a magnificent show this year. Just pruned them after this years flowering.
Please help! It is early September so we are heading toward fall. My 12 year old son did a great job weeding and cleaning our garden beds without suoervision and then pruned the back sides of our Annabelle hydrangeas, in a good- hearted but perhaps misguided effort to get a " neater " looking garden. There are a fair number of stalks cut to the ground!
Will this kill the remaining plant? . Please advise.
It's April, I didn't get a chance to prune and my stems are budding. The dead blooms are on top. Should I just prune the tops or prune down to bottom and start over???
I have the same question!
it sounds like the new blooms are growing in old wood with dead blooms on top. i found this article a day late and have pulled off just the old blooms and sticks that easily pulled off when i was raking leaves over the weekend. lets just hope for lots of flowers. for you the directions say to wait for new blooms to open then pull off the old ones.
diy craft tip. the old dried flower blooms and rhe old dead sticks that pull easily off the bush are great for dried flower arrangements wreaths and crafts. ?
Our Nikko is about 25 yrs old and has become huge. I have cut back to about 3 ft and discovered a jungle of branches inside. My plan is to cut dead wood back to the ground and cut off any side branches from main stems and thin out as well. Not sure what I will have left and assume no bloom this next spring. Does this sound ok?
As long as you have fun with them...
I am not so sure what you mean by 'fun'. do you mean, fun 'killing them' or what? Thanks
Did you ever see THE MANCHURIAN CANDIDATE? The original, with Sinatra?
I have a hydrangea tree - it has a solid trunk and then multiple branches coming out of the top. It bloomed in late August or September and now has dead flower bunches all over it. Should I trim off those dead flower bunches or leave them?
I have a hydrangea tree also and each year I cut the dead blooms off of them and they come back the next year double! I do use fertilizer spikes (3 of them) in the spring and fall.
I hope this thread is active enough to get some help..
What do we do if we’ve never gotten blooms? One is a Forever and Ever Red Hydrangea. Three are Cityline Mars #2. I tried cutting them back at the base one year, that didn’t do anything. I’ve left them alone, and that hasn’t done any thing. All are in partial sun / little more shade, as called for for these varieties. I planted them about 4 1/2 years ago. Location: Boston
Side note: I potted two Cityline root sprouts in the spring, which are now 8” plants. I have planted them in a sunny location even though they are supposed to be full/part shade, so we’ll see...
Thanks for any help!
I have three plants.... I forgot which kind they were though. It has been 4 years now and I have only gotten one single bloom on one of the plants. They are in full sun for 80% of the day and I live in Michigan. I cut them down one time, and just this past year I had them on old wood (they are about 3 feet tall) and I am in Michigan.
I think Hydrangeas in Boston (Im on the north shore) are like teenagers. They do whatever the hell they want whenever the hell they want to, regardless of what we say! Good luck! There is NO rhyme or reason to when or why they bloom. None. Trust me, Ive tried it all - different types, different soil, different amounts of sun, different ages . . . Ive kinda just gotten used to looking forward to the surprise blooms each June . . .and July and August . .. and this year . . .October.
Thank you for the giggle, I have a teen and boy is that the truth! Lucky for me my hydrangeas love it here, and grow like weeds. Zone 9.
My Mom cut hers back completely (almost to the ground) about 3 years ago and it has never really recovered. Did she do it permanent harm? (She lives in San Diego and it was a beautiful, long producing flowering bush before that.)
Very nice flower
Nice plant
Very nice flowers
I am not so sure what you mean by 'fun'. do you mean, fun 'killing them' or what? Thanks
wow nyc flowers
i have same ques
As long as you fun with them
Excellent
Those that wonderful bloom on old growth should only be pruned after flowering.
Very interesting post! Keepsharing
VERY NICE FLOWER
Very intersting flower
This flower fragrance is very nice
I like this tiny flowers.
I have issue with hydrangeas in front of my home.....my landscaper cut them back too far and now they don't flower. Did you find and answer?
wow!! it's so pretty!!
I love flowers!
Yeah!! It's excellent!
These bloom are really nice. Shrub bloom's gardening their fragrance are really nice. Thank you for sharing this post!
beautiful flowers
nice
its really so beautiful
marvellous
delightful
I really like your post about how you maintaining your garden's shrubs and nice pruning.
amazing
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Too good!
It`s really beautiful flowers
gorgeous
Too good!
Good Management!
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Thanks for the great tips! Because I have repeatedly had problems with pruning hydrangeas. This is a great article!
Thanks for sharing this post!
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Very nice
Looks nice
What a fantastic article! Thank you for always providing wonderful content.
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Hydrangea pruning has always been a challenge for me, but this guide simplifies it perfectly. I'm more reassured about managing mine now! However, I'll leave it to the experts , as it's not something I feel confident doing myself.
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