Overview
Dahlia 'Hy Clown' (D) is a bushy, clump-forming, tuberous perennial bedding in the genus Dahlia, part of the Asteraceae family, with green, occasionally dark-leaved foliage. Dahlia 'Hy Clown' (D) grows best in full sun, and tolerates loam soils and neutral pH. Its UK hardiness is rated H4. Suggested uses include borders, containers and cut flowers.
About
Dahlia 'Hy Clown' is a bedding, tuberous herbaceous perennial that produces blooms from July to October. It forms a multi-stemmed, clump-forming habit with green foliage that can occasionally be darker. Plant in full sun on neutral loam in a south-facing, sheltered spot and use in borders, containers or for cut flowers. The plant belongs to the Asteraceae family and suits season-long summer to autumn display.
About the genus
Dahlias come from the high meadows of Mexico, and somewhere in that heritage is the explanation for how they behave here: tender to frost, hungry, generous beyond all reason. No other plant gives you quite so much for so little. One tuber, planted after the last frost, becomes a shrub's worth of flowers by August — and the more you cut, the more they come.The range is faintly ridiculous. Tight pompoms, spiky cactus types, singles the bees adore, dinner-plates the size of your face. Whatever your garden's mood, there is a dahlia that agrees with it, which is probably why every generation falls out of love with them and then, a decade later, falls straight back in.They're at their best when much of the garden is winding down — late summer into autumn, flowering hard until the first frost calls time. I think of them as the encore. And they always play it.
Written by Henry
In the garden
Dahlia 'Hy Clown' sits within the Asteraceae family as a tuberous, herbaceous perennial grown for its extended summer-to-autumn flowering. From July to October it provides a steady run of blooms that make it useful where a prolonged display is wanted. The foliage is generally green but may present darker tones in some plants, adding subtle contrast in mixed plantings. Give this dahlia full sun and a south-facing, sheltered position to reduce wind exposure; it prefers loam of neutral pH and soil that remains moist but well-drained. The hardiness rating H4 (average) indicates it is suited to most UK gardens when sited in a sheltered spot. Good soil structure and consistent moisture regimes help sustain flowering through the season. Use Dahlia 'Hy Clown' where its flowering period will be most appreciated: edging borders, large containers on a sunny terrace, or a cutting patch for seasonal bouquets. Its tuberous nature and midsummer start to flowering mean it slots into planting schemes that need reliable blooms from mid-summer into autumn, supplying stems for cutting over several months.
Growing conditions
Best soil and position for Dahlia
- Sunlight
- Full sun
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- South-facing
- Exposure
- Sheltered
- UK hardiness
- H4
Plant details
Dahlia 'Hy Clown' (D) size, habit and characteristics
- Plant type
- Bedding, Herbaceous Perennial
- Habit
- Bushy, clump-forming, tuberous perennial
- Foliage
- Green, occasionally dark-leaved
- Suggested uses
- Borders, containers, cut flowers
Care notes
Pruning and caring for Dahlia 'Hy Clown' (D)
- Propagation
- Division, cuttings, seed
- Pest resistance
- Generally pest-resistant
- Disease resistance
- Generally disease-resistant
Frequently asked questions
Where is the best place to plant Dahlia 'Hy Clown' (D)?
Dahlia 'Hy Clown' (D) prefers full sun. It suits sheltered positions.
What soil does Dahlia 'Hy Clown' (D) need?
Dahlia 'Hy Clown' (D) grows best in loam soil. It prefers neutral soil. Aim for soil that stays moist but well-drained.
Is Dahlia 'Hy Clown' (D) hardy in the UK?
Dahlia 'Hy Clown' (D) has an RHS hardiness rating of H4, meaning it is hardy through an average UK winter, tolerating -10 to -5°C.
How do I propagate Dahlia 'Hy Clown' (D)?
Division, cuttings, seed.
More in the Dahlia genus
- Dahlia 'Clearview Cameron' (C)

- Dahlia 'Croydon Jumbo' (D)Dahlia

- Dahlia 'Elizabeth Snowden' (Col)

- Dahlia 'Katie's Velvet' (Col)Dahlia

- Dahlia 'LB Michael Braithwaite' (D)

- Dahlia 'Amazing Grace' (Misc)
- Dahlia 'Aurora's Kiss' (Ba)
- Dahlia 'Black Diamond' (Ba)