Informal Decorative Dahlia 'Who dun It'


Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Dahlia (DAHL-ya) (Info)
Cultivar: Who dun It
Hybridized by Swan Island
Registered or introduced: 2000
» View all varieties of Dahlias



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:

Unknown - Tell us

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

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are good for cutting

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


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


Clinton, Connecticut

Issaquah, Washington

Vancouver, Washington

Gardeners' Notes:


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.


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.


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

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