Illustration
Kelvin Floodlight
Dahlia 'Kelvin Floodlight'
Kelvin Floodlight blooms from July through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Kelvin Floodlight
Plant it in full sun. It prefers high water. It is hardy in USDA zones 8–10. Expect it to reach about 3.5 ft tall and 2 ft wide at maturity, in roughly 1 year (not yet checked).
What this means
Written with AI assistance and not yet checked plant by plant against recorded sources, so treat every fact above as a starting point. Its scientific name was checked against botanical registries, an audit keeps its values consistent with the rest of the library, and a July 2026 review re-read the main facts of every plant then in the library against horticultural authorities without recording a source for each, which is why none of that counts as checked here. The source-by-source check is working through the whole library in the open, and a checked plant says so in this row.
When to plant Kelvin Floodlight
Kelvin Floodlight is tender: plant it out after the last frost, once the soil has warmed. In zone 9, the middle of its hardy zones 8 to 10, that means February or March; where spring comes later, it goes out later. Expect flowers from July to October.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 9, the middle of this plant's hardy range, start with zone 9 in February. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Kelvin Floodlight get?
3.5 fttall5 ft 7 inan adult2 ftwideSee Kelvin Floodlight in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
Good to know about Kelvin Floodlight
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses, causing mild stomach upset and mild dermatitis. The leaves and tubers can also irritate skin, worse with sun exposure. per ASPCA and NC State
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.