-
Summer Bulbs & Tubers
Summer Bulbs & Tubers
-
Bare-root Perennials
Bare-root Perennials
-
Shop by Solution
Dahlia 'Kelvin Floodlight'
£4.49
Unit price perEstimated Delivery between January 10 and January 12.
Dahlia 'Kelvin Floodlight' is a summer-flowering dahlia grown from a tuber, loved for huge primrose-yellow blooms that glow at dusk. The fully double, show-stopping blooms sit above fresh foliage and bring instant impact to borders, cutting gardens and large pots.
Flowers appear from mid-summer until the first frosts, especially if you keep deadheading. Dahlias are excellent cut flowers—snip stems regularly to encourage new buds. Its bright yellow is a classic choice for exhibitions and big borders.
Plant in fertile, humus-rich soil in a sunny, sheltered position. Start tubers in pots under cover in March or April, then plant out after frost risk has passed, or plant directly outside in May. Set tubers about 10–15cm deep and space plants 45–60cm apart.
This variety typically reaches 0.5–1 m with a spread of around 0.1–0.5 m. Taller types benefit from staking in windy spots. Water during dry spells and feed with a high-potash fertiliser every couple of weeks once buds form.
In autumn, once frost blackens the foliage, cut stems back and lift tubers to store cool, dry and frost-free. In very mild areas you can mulch and leave them in the ground. Replant in spring for another season of colour.
Dahlia 'Kelvin Floodlight'
Dahlia 'Kelvin Floodlight' is a summer-flowering dahlia grown from a tuber, loved for huge primrose-yellow blooms that glow at dusk. The fully double, show-stopping blooms sit above fresh foliage and bring instant impact to borders, cutting gardens and large pots.
Flowers appear from mid-summer until the first frosts, especially if you keep deadheading. Dahlias are excellent cut flowers—snip stems regularly to encourage new buds. Its bright yellow is a classic choice for exhibitions and big borders.
Plant in fertile, humus-rich soil in a sunny, sheltered position. Start tubers in pots under cover in March or April, then plant out after frost risk has passed, or plant directly outside in May. Set tubers about 10–15cm deep and space plants 45–60cm apart.
This variety typically reaches 0.5–1 m with a spread of around 0.1–0.5 m. Taller types benefit from staking in windy spots. Water during dry spells and feed with a high-potash fertiliser every couple of weeks once buds form.
In autumn, once frost blackens the foliage, cut stems back and lift tubers to store cool, dry and frost-free. In very mild areas you can mulch and leave them in the ground. Replant in spring for another season of colour.
| Botanical name | Dahlia 'Kelvin Floodlight' |
| Flower colour | Very large, bright yellow double flowers |
| Tuber size | Grade I (Top Size) |
| Established height | 0.5–1 m |
| Established spread | 0.1–0.5 m |
| Plant spacing | 3–5 per m² |
| Leaf colour | Dark green |
| Habit | Clump-forming |
| Life cycle | Perennial |
| Hardiness | Half hardy (H3) |
| Years to establish | 1st year |
| Sunlight | Full sun |
| Position | Sheltered |
| Suitable for | Pots, Borders, Cutting garden |
| Soil acidity | Any |
| Soil moisture | Moist but well-drained |
| Soil type | Chalk, Clay, Loam, Sand |
| RHS Award (AGM) | No |
| Growing skill | Easy |
| Pollinator-friendly | No |
| Deer resistant | No |
Planting and Flowering Calendar
Key Features
Packed in paper
Packed peat-free
Great for Shade
Low maintenance
Perfect for pots
Good for cutting
The Finest Bulbs
We partner with elite growers to provide only top-size, professional-grade bulbs. Bigger bulbs mean stronger roots and more spectacular blooms.
A Greener Thumb
We are committed to a healthier planet, using sustainable growing practices and mindfully chosen, recyclable packaging.
An Unrivaled Selection
Discover an extensive collection of both timeless classics and rare, exclusive varieties to create a garden that is uniquely yours.
Our Bloom Guarantee
We stand behind our quality. From our expert planting guides to our customer service, we ensure your gardening success.
Kind Words from Our Gardeners
Arrived quickly and well-packaged. Planted them in some pots on the patio and they all came up. Look beautiful. Thank you!
Careane Wallace
The bulbs arrived beautifully packaged and you could just tell they were excellent quality. We had the most wonderful display of daffodils this spring on our patio. Simply stunning. Will definitely be ordering again
David P
I ordered the mixed hyacinth collection and the scent in my garden this April was absolutely heavenly. Every single bulb produced a strong, beautiful flower and the colours were stunning together. A fantastic purchase, I'll be back for more next year!
Eleanor R
Somerset