Ariston Dahlia Tubers

• Variety: Ariston
• Type: Ball dahlia
• Colour: Vivid rusty red
• Flower size: Up to 10cm (4in) across
• Height: 100cm
• Spread: 65cm
• Flowering: July to November
• Cutting: Excellent. Long-lasting in the vase, geometric form adds texture to arrangements
• Exhibition: Yes. Ball dahlias are a traditional show class
• RHS AGM: No
• Sold as: Single tubers, hand-graded, Dutch first-class quality
• Plant outdoors: March to July, when soil reaches 15°C (typically May in most of the UK)
• Delivered: From March. Collection from Castle Cary also available

Ariston: A Perfectly Round Flower in a Colour You Can't Quite Name

Ball dahlias look like nothing else in the garden. Where decorative types open flat and cactus dahlias spike outwards, a ball dahlia's petals curl inward along their length and arrange themselves in tight spirals, building up to an almost perfectly spherical bloom. Exhibitors have been showing ball dahlias for over a century. The form has to be right, or the judges notice.

Ariston does this in a vivid rusty red that sits somewhere between burnt sienna and terracotta. Warm and rich and unusual. The kind of colour that stops people in the garden because they can't quite name it.

The flowers are 10cm across, densely packed and surprisingly tough. Ball dahlias hold up well in rain because the tightly rolled petals don't trap water the way open decorative blooms do, and they're among the longest-lasting dahlias in a vase. The dense structure means the petals stay firm for days longer than looser flower forms. The plant itself is compact at a metre tall, with fresh green foliage and strong stems that rarely need support. It produces flowers freely from July right through to November.

What Goes with Ariston

The rusty red works beautifully in autumn-toned schemes. Plant alongside David Howard (burnt orange, dark bronze foliage) and the heritage apricot of Preference, a semi-cactus introduced in 1911 that has outlasted thousands of newer varieties, for a warm border that peaks in August and September. For a darker combination, pair Ariston with deep purple Ambition and the deep claret pompon Rocco. The geometric ball shape contrasts well with looser flower forms, so placing Ariston in front of a ruffled dinnerplate creates real textural depth. Miscanthus sinensis 'Morning Light' and bronze Carex grasses tie the warm tones together at ground level.

Why Ashridge?

Our dahlia tubers are Dutch first-class quality, imported direct and hand-graded by us. We discard undersized tubers so you get a clump with viable eyes, ready to show you what they can do. Delivered by next-day courier from March, with our one-year plant guarantee, Feefo Platinum Service Award, and human support from the team in Somerset. Browse our other ball dahlias or the complete dahlia collection.

Frequently Asked Questions

What is a ball dahlia?

Ball dahlias have fully double flowers where the petals curl inward for most of their length and arrange themselves in a spiral, building up to a globe-shaped bloom. They're typically 5 to 15cm across, smaller than most decorative dahlias, but the geometric perfection of the form makes them stand out in a border and especially in a vase. Pompon dahlias are the same shape but smaller still, under 5cm. Browse our ball dahlia range.

Is Ariston good for showing?

Ball dahlias are a traditional exhibition class, and Ariston's tight, symmetrical form and vivid colour make it a strong contender. For the best show blooms, disbud to one flower per stem and grow in rich, well-fed soil with consistent watering.

How does a ball dahlia compare to a decorative?

Different shape, different effect. Decorative dahlias have broad flat petals that open into a ruffled, relaxed flower. Ball dahlias have tightly rolled petals in spirals, creating a dense geometric globe. The two types look best planted together. Tight spheres give structure among the looser forms. Cut flower grower Georgie Newberry is a fan of Checkers, a red-and-white ball that proves the point about form.

Can Ariston grow in a pot?

At a metre tall it's pushing the limits for a container, and the results won't match open ground. If you want a ball dahlia for pots, Wine Eyed Jill at 90cm is a better fit, or the compact pompon Nescio. Our growing dahlias in containers guide covers the options.

I'm going on holiday in August. Will it survive a fortnight without deadheading?

Survive, yes. Look its best, no. Dahlias that aren't deadheaded put their energy into setting seed rather than producing more flowers. When you get back, cut everything spent right back, give it a thorough watering and a liquid feed, and it'll pick up again within a couple of weeks. The season runs to November so there's no need to panic. Full growing and aftercare advice is in our dahlia growing guide.