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PlantFiles: Informal Decorative Dahlia
Dahlia 'Who Dun It'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Dahlia (DAHL-ya) (Info)
Cultivar: Who Dun It
Registered or introduced: 2000

» View all varieties of Dahlias

2 members have or want this plant for trade.


Flower Size:
Small - 4 to 6 inches (100 to 150 mm) diameter

Bloom Color:
Lilac, Lavender, Mauve

Do not disbud

36-48 in. (90-120 cm)

18-24 in. (45-60 cm)

Unknown - Tell us

Other details:
Average Water Needs; Water regularly; do not overwater
Flowers are good for cutting

Soil pH requirements:
6.6 to 7.5 (neutral)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From leaf cuttings

Unknown - Tell us

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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to view:

By grannymarsh
Thumbnail #1 of Dahlia  by grannymarsh

By WaterCan2
Thumbnail #2 of Dahlia  by WaterCan2

By WaterCan2
Thumbnail #3 of Dahlia  by WaterCan2

By mgh
Thumbnail #4 of Dahlia  by mgh

By Poochella
Thumbnail #5 of Dahlia  by Poochella

By David_Paul
Thumbnail #6 of Dahlia  by David_Paul

By Gardening_Jim
Thumbnail #7 of Dahlia  by Gardening_Jim


1 positive
1 neutral
1 negative

Gardeners' Notes:

Neutral WaterCan2 On Sep 7, 2007, WaterCan2 from Eastern Long Island, NY (Zone 7a) wrote:

Mine took long to flower, probably because it grows so tall! At 6' 1" and growing, it's next bud should be opening around mid September, even though I planted them with a little extra time this year. The late bloom could be environmental or a typical species-specific characteristic. All I know is that I need a ladder to look at it head-on! Asthetically, I find the flower doesn't justify the height. If one places the plant toward the back of a display, the flower @ 5" in width and soft colors does not stand out enough. Best as a specimen display, it's height and the rigidity of its stalk are the first things you notice.

Negative Junctioncats On Jun 18, 2007, Junctioncats from Cambridge, VT (Zone 4a) wrote:

This is one dahlia I've had no luck with. I've tried for three years to get WhoDunIt to do anything other than sprout. The plant will come out of the ground about 6" and there it will stay. It will not produce buds, nothing. I know my source of tubers is A-1, so it must be something about this particular tuber not liking northern Vermont. If anyone has any ideas, I'd appreciate it.

Positive grannymarsh On May 5, 2006, grannymarsh from Marquette, MI (Zone 5a) wrote:

Beautiful flowers, the petals have a satiny sheen to them. Decent tuber production.


This plant has been said to grow in the following regions:

Clinton, Connecticut
Issaquah, Washington
Vancouver, Washington

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