Formal Decorative Dahlia, Dinner Plate Dahlia 'Kelvin Floodlight'


Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Dahlia (DAHL-ya) (Info)
Cultivar: Kelvin Floodlight
Additional cultivar information:(aka Kevin Floodlight)
Hybridized by McDougall
Registered or introduced: 1959
» View all varieties of Dahlias



Flower Size:

Giant - over 10 inches (250 mm) diameter

Bloom Color:





36-48 in. (90-120 cm)


18-24 in. (45-60 cm)




Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:


Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From herbaceous stem cuttings


Parts of plant are poisonous if ingested

Seed Collecting:

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

Foliage Color:


Bloom Characteristics:

Flowers are good for cutting

This plant is attractive to bees, butterflies and/or birds

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Can be grown as an annual


This plant is said to grow outdoors in the following regions:

Hayward, California

Hyampom, California

San Francisco, California

Santa Paula, California

Denver, Colorado

Grand Junction, Colorado

Eustis, Florida

Vero Beach, Florida

Atlanta, Georgia

Thomson, Georgia

Indianapolis, Indiana

Arlington, Massachusetts

Revere, Massachusetts

Worcester, Massachusetts

Haslett, Michigan

Saint Paul, Minnesota

Las Cruces, New Mexico

Binghamton, New York

Ithaca, New York

Southold, New York

Staten Island, New York

Apex, North Carolina

Winston Salem, North Carolina

Geneva, Ohio

Lynchburg, Ohio

Perrysburg, Ohio

Springfield, Ohio

Woodward, Oklahoma

Murrells Inlet, South Carolina

Barberton, Washington

Concrete, Washington

Poulsbo, Washington

Salmon Creek, Washington

Menasha, Wisconsin

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Gardeners' Notes:


On Oct 8, 2017, CoCrazyWoman from Denver, CO wrote:

The best Dahlia! I'm not a big fan of yellow, but this is my favorite Dahlia. It's easy and one of the first big ones to bloom every year. Strong plants around 3 ft tall. Blooms beautifully!!


On May 6, 2016, bobbieberecz from Concrete, WA wrote:

In western Washington state our winters can be long, wet and, in my home in the mountains, down to 5 degrees for a week or so with off and on nights of 10 to 20* 2 weeks at a time.. We go through several hard freezing and thawing spells each winter. I can't be bothered digging my bulbs and tubers up each winter, drying and storing them, so I leave them in the ground and would rather replace them if need be. Oddly enough, though the center of the tubers are pure mush from all the freezing, thawing and heavy rains, the off sets are solid and produce new plants each spring. One plant out of 10 didn't make it, but all the rest are doing fine----again. My soil is sandy loam and drains well, but my daughter who lives in a more temperate area about 40 miles away, has heavy, very wet poor-dra... read more


On Jul 24, 2014, lancer23 from San Francisco, CA wrote:

Big dinner plate size and easy to care for. Better flower production then other giant dahlias. Bloom size is big but plant size remains short. Will not hesitate to replant next yr.


On Feb 2, 2014, Myrtle3cats from Haslett, MI wrote:

I have grown Kelvin Floodlight in Vermont and in Michigan. Unlike most A or AA dahlias, this dinnerplate blooms very early, so is especially suitable for northern gardens. We plant a row of them in our front yard and they definitely get attention.


On Jan 4, 2014, eolivas103 from Las Cruces, NM (Zone 8a) wrote:

I accidently left this plant in the ground and it was just beautiful this year. I believe in the area I live, I should not leave Dahlia's in ground. But because of the success with this plant, I have left all the Dahlias in the ground this winter to see how they do. I do have trouble with this plant being too prolific of a bloomer. It's hard on the plant, so I have learned to pick off buds here and there so the plant stays healthier that way. The blooms are 8" at least. Update to post I previously made: I have since learned that in my zone, Dahlia's can be left in the ground and they all have come back and are better than last year. I will leave them in the ground from now on.


On Aug 17, 2006, bigcityal from Appleton, WI (Zone 5a) wrote:

Nice large yellow dahlia. Steady bloomer with no problems.


On Feb 20, 2006, aaaluther from Chillicothe, OH wrote:

Real nice yellow dahlia----easy to grow, and stores well.


On Oct 26, 2004, lmelling from Ithaca, NY (Zone 5b) wrote:

Beautiful long lasting bright yellow blooms. Mine generally reach about 8" - 10" across. I find mine do best when planted in containers (instead of directly in garden) in full sun with rich, loose, well drained soil. Give a spritz of liquid fertilizer once ever couple of weeks. Plant the bulbs at about 6" depth.

Absolutely beautiful, dependable dahlia that I've grown for the last 5 years. Since I'm in zone 5, I set the bulbs out in May (usually mid month). If frost is possible, cover tender vegetation on those nights with a cardboard box or remay cloth. Blooms generally appear by the end of June/ early July and continue until frost. When frost arrives, lift bulbs, cut off plant close to top of bulb, clean off with water and put in airy place to dry. I store mine in my... read more


On Aug 22, 2003, doglover from Lilburn, GA (Zone 7b) wrote:

These flowers were huge! Truly dinnerplate sized. Easy to care for also; I live in Z7 and dont have to dig them up, but should since they always need dividing. They are very vigorous.


On Aug 31, 2002, mystic from Ewing, KY (Zone 6a) wrote:

In warmer climates you maybe able to leave the tubers in the ground with heavy mulch. But for me in Zone 6 I have to dig the tubers before first frost.Clean and let dry good.Pack in dry peat and store in cool dry place.