Understanding dahlia groups
A list of the different dahlia groups, along with some classification info and an example of a variety in each group.
-
- Plants
- New Plants
- Perennials for Spring and Summer Planting
- Border Fillers
- Chrysanthemums
- Climbers
- Container Plants
- Container Plant Collections
- Cosmos
- Cut Flowers
- Cut Flower Collections
- Dahlias (Potted)
- For Shade and Ground Cover
- Pelargoniums
- Roses
- Salvias
- Shrubs
- Sweet Pea Seedlings
- See all categories...
- Plants A to Z
- Plants
-
-
-
-
Goes well with...
Useful kit...
Recently Viewed
Dahlia 'Black Jack'
I went to the Dutch dahlia trial fields last autumn, briefed to choose no more black dahlias, but my-oh-my you just can't say no to this one. More
| 1 tuber 229352-1 | £4.95 |
|
||
| 3 tubers 229352-3 | £13.50 |
|
||
| 1 x 3 litre pot 229352-3L | £12.50 |
|
More Details
I went to the Dutch dahlia trial fields last autumn, briefed to choose no more black dahlias, but my-oh-my you just can't say no to this one. It has marvellous sculptural buds and huge, spiky sea anemone flowers.
This can be gift wrapped in our exclusive hessian sack, with ribbon and a Sarah Raven gift card. You will be able to add this to your basket once you begin the checkout process. To add a gift message to your order, simply fill out the details at the delivery stage of the checkout.
Please note: only items which are showing ‘in stock’ can be gift wrapped.
| Genus | Dahlia |
| Group/Species |
Decorative Group Broad and flat petals, normally bluntly pointed, with no central disc showing. Click here for more information about dahlia groups. |
| Variety | Black Jack |
| Type | Tender Perennial |
| Common Name | Dahlia |
| Border Position | Cutting Garden |
| Bulb Size | I |
| Soil Type | Broad Tolerance |
| Scent | Unscented |
| Site | Full Sun |
| Moisture | Moist but Well-drained |
| Height | 1.5m (5ft) |
| Spacing | 75cm (30in) |
| Sowing, Seeds, Planting | Plant just under the soil surface after the last frosts. Alternativley pot them up undercover March or early April in a generous pot (at least 2 litre) filled with multi-purpose potting compost. Place them in a light, frost-free place and keep the compost moist. Pinch out their growing tips when they have reached about 8" tall. They will have formed bushy plants by the time the frosts have ended and will be in flower by the beginning of July. If you don’t have anywhere to grow the potted tubers, you can put them straight into the ground when the frosts are nearly over, mulching them or protecting with a cloche or protective horticultural fleece if the foliage appears before the frosts are over, but this will delay flowering. |
| Care Tips | Support with a stout stick, tie in every couple of weeks. In the south you can mulch deeply and overwinter them in the ground, alternatively, lift and overwinter your dahlias frost free undercover. |
| Flowering | July - November |
| Vase Life | Only pick dahlias in full flower. Recut the hollow stem ends under water to avoid airlocks. |
| Harvesting | Flower production 5 months |
| Cooking Notes | All dahlia flowers are edible. I use the petals scattered over salad and to decorate a range of puddings |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
- Sow Under Cover/Plant Indoors
- Direct Sow/Plant Outdoors
- Flowers/Harvest
Advice & Videos
History of the dahlia
First discovered by Aztec Indians and used for food and medicine, this tuber has an interesting history of cultivation.
How to plant and grow dahlia tubers
Discover how to grow strong, healthy dahlias – how to plant, look after and overwinter them, and what to do with your bulbs when they arrive.
How to overwinter dahlia tubers
Sarah discusses the best options for overwintering dahlias – lifting or mulching.
Sublime dark dahlia flower arrangement
Sarah shows you how to make a gorgeous large arrangement of dahlias.
Planting narcissi bulbs with dahlias
Have a beautiful display of flowers in your garden from March to the first frosts with this simple planting technique.
New favourite dahlia arrangement
Sarah shows you how to make a quick arrangement of colourful dahlias.
Growing dahlias in pots
Sarah shows you her favourite dahlia varieties for pots, and gives you some tips on how to grow them successfully.
How to take dahlia cuttings
Watch and learn how to take dahlia cuttings – turn 1 tuber into 10.
Delivery
Bulb Delivery - When in stock, please allow up to 5 days for despatch.
Plant Delivery - When in stock, please allow up to 4-6 weeks for despatch. For fruit & veg bare roots/crowns or potatoes, please allow up to 2 weeks for despatch.
Click here to find out more information about our delivery rates and times.
Dahlia 'Black Jack' reviews
Average based on 10 reviews
|
Reviewed 6th August 2019 by Ian Delivered as a well protected package. Plants were in 1st class condition, look as though they will provide great blooms. Would recommend and use Sarah again. |
|
Reviewed 1st August 2019 by Ian
This has just flowered it's stunning |
|
Reviewed 31st July 2019 by Julie Not so quick to grow and much smaller than the others. Not sure what I could have done differently. |
|
Reviewed 31st July 2019 by Katie
|
|
Reviewed 31st July 2019 by Deborah This was the most disappointing of all the dahlias purchased. Very little growth, no buds, hopefully will get at least one flower by the end of the seasons |
|
Reviewed 31st July 2019 by Maxine Lovely flowers grown well |
|
Reviewed 31st July 2019 by Mrs Sadler Hasn't made an appearance. |
|
Reviewed 31st July 2019 by Sandra Good quality plants and in good condition, the slugs ate two of them |
|
Reviewed 31st July 2019 by Melanie Healthy tuber , now growing |
|
Reviewed 29th May 2019 by Melanie Healthy tuber , now growing |
