PlantsDahlias→Tree Dahlia (Dahlia imperialis)

Common names:
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Data specific to Dahlias (Edit)
Color: Lavender (L)
Pink (PK)

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Plant Height: 10 to 30 feet
Leaves: Other: Edible
Flowers: Showy
Bloom Size: 6"-12"
Flower Time: Fall
Late fall or early winter
Resistances: Deer Resistant
Propagation: Seeds: Will not come true from seed
Propagation: Other methods: Cuttings: Stem
Division
Other: Propagate by taking cuttings of newly emerged shoots
Containers: Suitable in 3 gallon or larger

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Celebrating Dahlias!Celebrating Dahlias!
By dave on September 26, 2015

We open the Dahlias Celebration Week with a look at the top cultivars, top comments, most thumbed images, and more!

(Full article17 comments)
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Photo gallery:
Location: In my Northern California gardenDate: 2011-11-21
By zuzu
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Location: in my garden in Del Norte county, Ca. amongst the RedwoodsDate: 2020-11-20
By Strever
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Photo courtesy of Annie's Annuals and Perennials
By Calif_Sue
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Location: Del Norte CalifDate: 2015-11-29amongst the Redwoods
By Strever
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Location: in my garden in Del Norte county, Ca. amongst the RedwoodsDate: 2020-11-20
By Strever
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Location: Del Norte Calif amongst the redwoodsDate: 2015-11-29                               amongst the Redwoods
By Strever
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Location: Del Norte CalifDate: 2015-11-2918 ft tall amongst the Redwoods
By Strever
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Location: In Zuzu's gardenDate: 2011-11-22
By Calif_Sue
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Location: My garden near Lincon UKDate: 2008-08-24It needs space and a warm south wall to grow well where I live.
By JRsbugs
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Location: My garden near Lincon UKDate: 2009-11-13I never see them open, the flowers make when day length decreases
By JRsbugs
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Location:  Annie's Annuals NurseryPhoto courtesy of Annie's Annuals and Perennials
By Calif_Sue
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Location: Crescent CityDate: 2014-12-25Pink Dahlia imperialis flowers did not get frosted this Dec
By Strever
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This plant is tagged in:
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Comments:
Posted by JRsbugs (Near Lincoln UK) on Dec 23, 2011 9:51 AM

I've had this plant for around 6 years, it does well by my south wall, but living over 53 degrees latitude north it doesn't get the day length requirements soon enough for the flower buds to open before the plant gets frozen. It has often got through frost to -5C, the leaves have had some frost on them and survived it, but an extra degree to -6C or different frost conditions usually kill it.

In the UK it grows to around 11 feet tall by my wall. I have grown more plants from it and put in other places in the garden, but they never thrive, although some have lived. Buds in the last three years have looked so promising. This year some plants farther south in England made flowers in mid November but mine were about to be frozen by mid December, so I cut the stem to put in water. There's only one promising bud, which I am not holding my hopes for. Getting to mid December is a miracle in itself. Unless we happen to have very mild weather it would struggle to flower in very low winter temperatures here. I keep trying and hoping, though!

Wind can be a problem when the new stems are still soft. I have had some blow over, but with age they go woody. My plant survived in the ground after the very hard winter 2010/11 in the UK, with 7 weeks continually below freezing and with temperatures down to -17C.

New plants can easily be grown from young shoots taken with a little of the woody base. I have also grown them from the stem near the base after winter, which was still "green" inside although the stems are hollow. If you have a live stem, cut a length either side of two nodes with a length of stem between them, and place just under the surface of compost laid on the side in a large pot. They will root and make new plants from the nodes, so with two nodes you will get two plants, which can be cut apart once the roots are sufficiently formed and repotted individually. I did this in a cold greenhouse, where the pot got plenty of sun. If they are grown in the ground in a greenhouse, I might get more chance of flowers. I now have a greenhouse with broken glass in the roof, so next year maybe I will grow another plant to put in that greenhouse even though it gets some shade. Worth a try!

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Posted by zuzu (Northern California - Zone 9a) on Nov 21, 2011 6:17 PM

This plant is not a good choice for most gardens. In my garden, for instance, it grows to about 20-25 feet tall each year, but it's usually snapped in half by the first strong winter wind. Another drawback is that it doesn't bloom until late November here in zone 9, but it succumbs to frost within a few weeks, so the enjoyment factor is quite fleeting when it comes to the blooms.

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Discussion Threads about this plant
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What's everyone been buying for dahlias in 2021? by ScarletTricycle Jan 16, 2021 12:59 PM 44
Which variety of dahlia do you love? by Aphria Dec 20, 2018 2:19 AM 11
Tree ID? by Nicxr Oct 15, 2018 2:24 AM 1
blooming in Dec by Strever Dec 18, 2017 5:05 PM 21
Blooming in November.... by wcgypsy Dec 9, 2017 7:32 PM 7
Banner for August 22, 2016 by bootandall by bootandall Aug 22, 2016 6:56 PM 7
Let's introduce ourselves 2 by PollyK Dec 5, 2012 2:46 AM 225
Chat thread by wcgypsy Apr 16, 2021 9:57 PM 12,624

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