Dahlia 'Thomas A. Edison'

A true show-stopping dahlia and one of my long-standing favourites. Mix with other dahlias or plant with veg. More
1 tuber 229146-1 £3.95
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3 tubers 229146-3 £7.50
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1 x 3 litre pot 229146-3L £10.50 Delivery mid June
When in stock, please allow up to 3-4 weeks for despatch. For fruit & veg bare roots/crowns, please allow up to 2 weeks for despatch.
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A true show-stopping dahlia and one of my long-standing favourites. Mixed with other dahlias or planted with veg, it looks superb with cabbages and Kale 'Redbor' and is the real show-stopper in the autumn Oast garden.

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 Thomas A. Edison
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 1.2m (4ft)
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.
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
Understanding dahlia groups

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

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.


Bulb Delivery - When in stock, please allow 2-3 days for despatch.

Plant Delivery - When in stock, please allow up to 3-4 weeks for despatch. For fruit & veg bare roots/crowns, please allow up to 2 weeks for despatch.

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

Dahlia 'Thomas A. Edison' reviews

* * * * * Average based on 8 reviews
Dahlia Thomas A.Edison

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Reviewed 3rd July 2018 by Alison

I've never bothered with writing a review before but I am so impressed with this utterly gorgeous dahlia that I'm bursting with praise for this truly beautiful plant. The colour is deep and goes with my other dahlias or looks stunning with the ammi sowed from you. If you only buy one dahlia, then this is it but leave some more for me next year !


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Reviewed 18th November 2016 by K Beaz

I got these to go with American Dawn. They go beautifully together but I thought these with their deep rich colour were even better. I've had lots of compliments at the allotment where they flowered so prodigiously I had often had armfuls to give a way.

Absolutely Stunning

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Reviewed 16th October 2016 by Beverley Goggin

I purchased a tuber for this particular Dahlia from Sarah Raven earlier this year. It is an absolute stunner both in size and colour. I never lift my tubers but choose to heavily mulch my garden instead. That said, I've never lost any of my Dahlia's (all of which are from Sarah Raven) and look forward to enjoying many more beautiful blooms for years to come.

Huge and Heavenly

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Reviewed 23rd January 2016 by Judi Delaney

I bought my original tuber from here about 5 years ago, and following Sarah's instructions for lifting and replanting each year, this has proved to be one of the most stunning dahlias in my garden. It produces huge flowers with the most incredible clear colour, and when in a vase everyone always comments on it. I also follow the advice to keep cutting the blooms from the plants once a week to help it keep producing and it really does pay dividends, and the kitchen looks wonderful with jugs full of these beauties.


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Reviewed 23rd August 2015 by Mrs J Remington

Have grown this in a large terracotta pot and have been amazed by it. The flowers have all been as large as my stretched hand span and the depth of the colour is breathtaking. If you love dahlias this should be high on your list to grow.

Massive purple flowers

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Reviewed 11th August 2015 by Jemma Kennedy

This dahlia hasn't grow very tall yet at 35cm (all the others are 70cm+) but the two flowers it has produced are 17cm in diameter and very beautiful. Quite stunning. Will buy more tubers next year.

Great mixed with dark dahlias, especially Chat Noir

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Reviewed 12th April 2015 by Dr C

I grow these mixed in with Chat Noir and they grow well together but, more importantly, look great together - particularly in a vase with a few crocosmia stems. I always follow Sarah's planting instructions and the tubers are always of great quality when they arrive, ready for planting. The young shoots will need protection from slugs and snails until they get established and they will need some strong staking. Regular deadheading will keep them flowering until the first frosts.

Just great

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Reviewed 13th January 2015 by Jill Williams

Having had my dahlia bed flooded in January I reinvested in case I had lost them all - in fact about half grew very well. One of my 'new' choices was Thomas Edison. I started them off indoors and Thomas Edison gave me three splendid plants which started flowering in June and went on till November, giving loads of colour and plenty to cut for the house. It was always the one which visitors commented on first - amazing depth of colour and robust plants. Plants have to earn their place for me in Brittany, with a garden only 3 metres wide and 50 m long, sloping down to the river, and everything always 'on view'. The dahlias are in the lower 'fifth' and draw the eye down to tempt us away from the house - even though the walk back is a bit of an effort at 84! - and Thomas Edison certainly earns his place.