• Formal decorative (estimated)
  • Perennial
  • Zones 9–11
  • Yellow
  • Double

Kelvin Floodlight

Perennial formal decorative dahlia in yellow, blooming in midsummer, late summer, and fall. Dinnerplate-size formal decorative blooms of bright yellow, up to 10 inches across. USDA zones 9–11.

Single source · Values marked like this (estimated) are estimates.

Buy from $13.00

1 / 2

A Kelvin Floodlight dahlia flower up close on the plant
A Kelvin Floodlight dahlia flower up close on the plant

2 / 2

Kelvin Floodlight dahlia plants in bloom in a garden
Kelvin Floodlight dahlia plants in bloom in a garden

At a glance

Flower form
Formal decorative (estimated) Double · Large (dinnerplate) · 10 in (25 cm)
Colors
  • Yellow
Blooms
Midsummer, Late summer, Fall
Vase life
Not grown for cutting
Height
3½ ft (102 cm)
Sunlight
Full sun
Hardiness
USDA zones 9–11 Perennial

Lift or treat as an annual below zone 9.

Planted as
Tuber
Botanical name
Dahlia hybrid

In the garden

  • Occasionally severely damaged by deer (Rutgers rating)

Find your frost dates and zone by ZIP code

Origin

Sold by Longfield Gardens as a garden favorite since about 1959.

Sources

Where to buy

Prices rechecked daily
  • White Flower FarmBulbs

    Pack size not listed

    Check availability

    $13.00Checked Oct 14, 2026
  • Spring Hill NurseryBulbs

    Pack size not listed

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    $14.50Checked Oct 14, 2026
  • Longfield GardensBulbs

    Pack size not listed

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    $15.75Checked Oct 14, 2026
  • High Country GardensBulbs

    Bag of 3

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    $15.99Checked Oct 14, 2026
  • Breck'sBulbs

    Pack size not listed

    Check availability

    $21.99Checked Oct 14, 2026

We may earn a commission when you buy through these links. Your price stays the same. Prices checked Oct 14, 2026.

All photos

  • A Kelvin Floodlight dahlia flower up close on the plant
    A Kelvin Floodlight dahlia flower up close on the plant
  • Kelvin Floodlight dahlia plants in bloom in a garden
    Kelvin Floodlight dahlia plants in bloom in a garden

Questions

Is Kelvin Floodlight hardy in my zone?

Kelvin Floodlight survives winter in the ground in USDA zones 9 to 11. In colder zones treat it as an annual or lift it before the ground freezes.

Does Kelvin Floodlight need full sun?

Kelvin Floodlight grows in full sun.

When does Kelvin Floodlight bloom?

Kelvin Floodlight blooms in midsummer, late summer, and fall.

Is Kelvin Floodlight good for cutting?

Our sources don't list Kelvin Floodlight as a cut flower or give a vase life for it.

See also

See all →
A Black Satin dahlia flower up close on the plant Black Satin Formal decorative dahlia with 4 in deep black-red blooms. Formal decorativeMiniatureMidsummer
A David Howard dahlia flower up close on the plant David Howard Pumpkin-orange formal decorative dahlia with dark foliage, 4-6 inch blooms. Formal decorativeSmallMidsummer
A Diva dahlia flower up close on the plant Diva Formal decorative dahlia with 6-inch dark purple blooms on 4.5-foot plants. Formal decorativeSmallMidsummer
A Fluffles dahlia flower up close on the plant Fluffles Formal decorative dahlia with 5-inch lavender pink blooms, white at the center, on 4.5-foot plants. Formal decorativeSmallMidsummer

Same colors

See all →
A Bora Bora dahlia flower up close on the plant Bora Bora Coral pink and yellow semi-cactus dahlia, 15-20 cm blooms, 70 to 100 cm tall. Semi-cactusMediumMidsummer
A Firepot dahlia flower up close on the plant Firepot Orange waterlily dahlia with 3-inch blooms on compact 2-foot plants. WaterlilySmallLate summer
A Glorie van Heemstede dahlia flower up close on the plant Glorie van Heemstede Golden yellow waterlily dahlia, 15 cm blooms on erect stems, 130 cm tall. WaterlilySmallMidsummer
A Kasasagi dahlia flower up close on the plant Kasasagi Yellow and red pompon dahlia, 2-inch blooms on 3.5-foot plants. PomponMiniatureMidsummer

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