Photo by Melody

PlantFiles: Decorative Dahlia
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; Year of Registration or Introduction: 1959

» View all varieties of Dahlias

6 vendors have this plant for sale.

6 members have or want this plant for trade.


Flower Size:
Giant - over 10 inches (250 mm) diameter

Bloom Color:



24-36 in. (60-90 cm)


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater
Flowers are good for cutting
Flowers are good for drying and preserving
Suitable for growing in containers

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)

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

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There are a total of 23 photos.
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7 positives
1 neutral
No negatives

Gardeners' Notes:

Positive lancer23 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.

Positive Myrtle3cats 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.

Positive eolivas103 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.

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

Nice large yellow dahlia. Steady bloomer with no problems.

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

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

Positive lmelling 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 basement over winter in net bags hanging up. Or put in box with a little peat moss or wood chips and store in cool dark place (45 - 55 degrees).

Because this is a dinnerplate dahlia, if the blooms reach 8+ inches across, you can dry these for use in dried arrangements and they will form a nice fist sized dried flower when fully dried. Color will hold for about 1 year.

To dry: cut (just) fully opened flower and leave a short (4" stem). Poke a 22 ga or 18 ga wire through the flower close to but not in the center of the flower. Loop the top wire into a U and pull down through the opposite side of the flower. Hang upside down in a warm dark place to dry (about 3 weeks). When dry, spray well with a flower preservative or hair spray to seal. I have read that you can preserve the blossoms using silica gel as well, but if you intend to do more than 1 or 2 flowers, air drying is best. Flowers dried in silica gel will absorb moisture from the air and fall apart much quicker.

Positive doglover 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.

Neutral mystic 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.


This plant has been said to grow 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
Poulsbo, Washington
Menasha, Wisconsin

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