Dahlia, Coltness
Dahlia, Coltness
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Dahlia ‘Coltness Hybrids’
Contains 50 seeds.
A charming bedding variety, producing compact plants topped with single flowers in a wide range of bright, cheerful colours. Reaching around 45–60cm tall, they’re perfect for borders, containers and mass planting, bringing reliable colour right through summer.
Growing dahlias from seed gives you the best of both worlds — an affordable first‑year display and the chance to lift and store your own tubers for planting again the following season. Each plant develops its own tuber, making this a brilliant and economical way to build a long‑lasting dahlia collection.
Key information
- Sow: February to March
- Germination: 7 - 21 days
- Blooms: July to October
- Height: to 45cm | Spread: to 35cm
- Perennial, often grown from seed as a half-hardy annual
- Full sun
For more information on growing dahlias, check out our growing guides.
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Growing Guides from Collie Flowers
You'll find a link to the specific growing guide for these seeds above, but if you want a more general look around and to find some advice, all of our sowing and growing information is available for you to use and refer to as you grow your garden.
But, if you'd prefer to have a tool you can carry in your pocket and use whenever you're planning, pottering or checking what to do next, why not manage your garden and access all of our growing guides through our free Sow & Grow App.