40 seeds 153002 £1.95 In stock
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More Details

Marvellous, spiky sea-urchin dahlias, which are great for cutting and will flower in the garden for many years.

Genus Dahlia
Group/Species variabilis
Variety 'Cactus Mixed Colours'
Type Tender Perennial
Common Name Dahlia
Border Position Back, Middle
Soil Type Acid, Chalky, Fertile, Neutral
Scent Unscented
Site Full Sun
Moisture Moist but Well-drained
Height 1.2m (4ft)
Spacing 65cm (25in)
Sowing, Seeds, Planting Sow the seeds onto the surface of the compost and cover with a layer of vermiculite. Cover the trays with a clear plastic bag, until the first seedlings are visible. Do not allow to dry out. 
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.
Flowering July - October, 16 weeks from sowing
Harvesting Flower production 3-5 months
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.

Understanding dahlia groups

A list of the different dahlia groups, along with some classification info and an example of a variety in each group.

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.

Overwintering dahlias at Perch Hill

Sarah shows you how she overwinters her dahlia tubers at Perch Hill.

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.

How to take dahlia cuttings

Sarah shows you how to take dahlia cuttings from tubers.

How to plant up your dahlia tubers

In this video Sarah shows you how to plant up your dahlia tubers.

Delivery

Seeds Delivery - Following the recent relocation of our warehouse, please allow up to 5 working days for despatch.

Click here to find out more information about our delivery rates and times.

Dahlia Cactus Mix reviews

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Reviewed 25th April 2020 by Caroline

Germinated well and pricked out seedlings 18 days after sowing indoors. This is the first year I have sown them so can’t comment on the flowers.

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Reviewed 17th August 2019 by Dawn

Top marks for these. Sowed some last year and they were so admired that I bought more seeds this year to give to neighbours. Last years plants still going strong and lovely as cut flowers, they seem to have seeded themselves about but at the time of writing have not flowered so can't comment as to how well the seedlings are doing.

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Reviewed 31st July 2019 by Gill

Best of my purchases 3large pots of blooms

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Reviewed 31st July 2019 by Sheelagh

Lovely but vigour less than Bishops children. In my garden at least

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Reviewed 31st July 2019 by Nikki

Wonderful wonderful seeds lots germinated and are growing into gorgeous healthy plants. Still waiting on the flowers but I planted them late in the season - am very pleased with the quality.

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Reviewed 31st July 2019 by Susanna

Cactus mx

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Reviewed 10th October 2018 by pam@west-lynne.co.uk

I have grown dahlias from seeds this year from the cactus mix as well as, experimentally, from Magenta Star, a Sarah Raven plant that I’ve had for two or three years. The cactus mix seeds were a delightful variety of, mostly single, brightly coloured flowers. Each is a type that I would hope to overwinter...plenty of mulch, I hope, should see them through. As an aside, the plants from Magenta star vary from light pink to red but none has the dark leaves of the parent plant. I’ll take cuttings in Spring.

Dazzling dahlias

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Reviewed 21st August 2017 by Linda Jackson

I've grown dahlias from tubers with mixed success so tried seeds this year without great expectations but they are the best dahlias I've grown. Easy and reliable to germinate, sturdy plants some of which are well over a metre high and with masses of flowers from mid June. The colours are lovely by and large although I'm not a fan of acid yellow, with some better than named varieties and what's wrong with a bit of serendipity in the garden? Brilliant plants and all for £1.95.