1 tuber 229128-1 £3.95

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3 tubers 229128-3 £9.95

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A classic and splendid cactus dahlia with spiky thin petals – and lots of them – in brilliant magenta pink- purple.

Our dahlias:

  • are first class, healthy tubers – the largest and best you can buy.
  • come with full planting, spacing and cultivating instructions for beginner gardeners
  • tubers should be potted up when they arrive and be kept in a light, frost-free place until the frosts are over and then be planted into the 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 Cactus Group

Similar to semi-cactus, but with narrower petals. Also includes Fimbriated Cactus dahlias. Click here for more information about dahlia groups.

Variety Hillcrest Roal
Type Tender Perennial Tuber
Common Name Dahlia
Border Position Back, Middle
Bulb Size I
Soil Type Acid, Chalky, Fertile, Neutral
Scent Unscented
Site Full Sun
Moisture Moist but Well-drained
Height 1m (3ft 3in)
Spacing Plant just under the soil surface, 75cm (30in) apart.
Sowing, Seeds, Planting 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
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.

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.

Planting up your dahlia tubers

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

How to plant and grow dahlia tubers

Find out how to grow strong, healthy dahlias this spring – how to plant, look after and overwinter them, and what to do with your bulbs when...

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.

Delivery

Bulb Delivery - When in stock, please allow up to 2 weeks for delivery.

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

Dahlia 'Hillcrest Royal' reviews

* * * - - Average based on 7 reviews

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Reviewed 21st August 2019 by Sarah

Sadly this tuber rotted after going outside in early June although it had started sprouting in its indoor pot. Not my usual experience with Sarah Raven tubers. My garden is normally very dahlia friendly, the weather has been favourable and the others are doing well - not sure what went wrong!

* * - - -

Reviewed 12th August 2019 by Blenda

This dahlia has crimson flowers and not magenta-pink purple so I am disappointed.

* - - - -

Reviewed 1st August 2019 by Bob

Very disappointed - stunted growth with no flowers. Tubers were potted on delivery and kept in sheltered conditions.

* * - - -

Reviewed 31st July 2019 by Margaret

OK but very small plant
No

* * * * *

Reviewed 31st July 2019 by Christine

Advised immediately upon ordering when to expect plant, which arrived in excellent condition. Tuber grew as expected and as of today only one bloom so far, which is beautiful. Exactly as illustrated in catalogue.

* * * * -

Reviewed 31st July 2019 by Ms Williamson

Stunning!

* * * * -

Reviewed 13th October 2018 by Helen

The colour of these dahlias was out of this world. When I looked at them in my garden they looked as if they'd been photoshopped in! I got these as tubers and the plant grew strong with many blooms. Long stems and good vase life. My only criticism is that at the end of the growing season the flowers produced were a washed out purple and not the vivid purple and magenta they had been, but I got several months of the latter.