Dahlia 'Penhill Watermelon’

Similar to ‘Labyrinth’ in glamour and soft, curvy beauty, but more floriferous and with a good vase life. It’s one of the new on-trend must-have dahlias for the garden and vase. More
1 tuber 229333-1 £4.50

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3 tubers 229333-3 £9.50

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More Details

This comes highly recommended from flower growers such as Rachel Siegfried (Green and Gorgeous) – it’s like ‘Labyrinth’ in glamour and soft, curvy beauty, but more floriferous and with a good vase life. It’s one of the new on-trend must-have dahlias for the garden and vase.

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.

Genus Dahlia
Variety Penhill Watermelon
Type Tender Perennial Tuber
Border Position Back, Middle
Bulb Size 1
Soil Type Acid, Chalky, Fertile, Neutral
Scent Unscented
Site Full Sun
Moisture Moist but Well-drained
Height 1m (39in)
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
How to take dahlia cuttings

Watch and learn how to take dahlia cuttings – turn 1 tuber into 10.

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.

Delivery

Bulb Delivery - When in stock, please allow up to 1 week for delivery.

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

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Dahlia 'Penhill Watermelon’ reviews

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Showstopper!

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Reviewed 27th June 2018 by Stevie Gavin

This is an incredible size, much bigger than i expected, very pretty colour although has much more of a creamy/yellow centre than the image above. Its a real talking point in the garden.