Garden Wonder Dahlia Tubers

• Variety: Garden Wonder
• Type: Decorative
• Colour: Vivid deep crimson-red. Fully double
• Flower size: 10 to 15cm across
• Height: 90cm
• Spread: 40cm
• Flowering: July to November
• Cutting: Yes. Strong stout stems, popular exhibition variety
• Exhibition: Yes. A popular choice at flower shows
• 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

Garden Wonder: The Red Dahlia That Show Judges and Beginners Both Reach For

There's a reason certain dahlias appear on show benches year after year. Garden Wonder is one of them. The flowers are a vivid, clean crimson-red, fully double, 10 to 15cm across, held on stout stems above compact, attractive green foliage. The colour doesn't fade, doesn't streak, doesn't shift. It's red. It stays red. It's the kind of red that can anchor a border or dominate a vase arrangement.

The plant is compact at 90cm and unusually narrow at 40cm spread, which makes it one of the easiest dahlias to place. It fits into smaller gardens, works in large pots, and tucks into a border without elbowing its neighbours. The stems are so stout they rarely need staking even at full height, which is unusual for a dahlia with flowers this size.

For beginners, Garden Wonder is forgiving. For exhibitors, it's reliable. It does the basics well, and it does them every year.

What Goes with Garden Wonder

Crimson red is a strong colour that either leads a scheme or fights with it. For a hot border, plant with the golden yellow of Bishop of York and the warm orange of Sylvia (ball form, brown stems). For something richer and darker, the near-black Dark Spirit and the deep claret pompon Rocco build a moody palette. Echinacea and Rudbeckia are natural late-border companions, extending the warm tones through to autumn.

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 grow. 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 full decorative dahlia range or the complete dahlia collection.

Frequently Asked Questions

Is Garden Wonder good for showing?

A popular exhibition choice. The clean crimson colour, consistent form and reliable performance make it a regular on the show bench. For the best competition blooms, disbud to one flower per stem and grow in rich, well-fed soil. The stout stems hold flowers steady for transport, which exhibitors appreciate. Full growing detail in our dahlia growing guide.

Can I grow Garden Wonder in a pot?

Very well. At 90cm with a narrow 40cm spread, it's one of the most container-friendly decorative dahlias. Use a pot of at least 30cm across and deep, and a sunny, sheltered spot. The stout stems mean you probably won't need a stake even in a pot. Our container guide covers compost, feeding and overwintering.

Does Garden Wonder need staking?

Less than almost any other dahlia of this flower size. The stems are unusually stout and self-supporting. In a sheltered garden you can probably leave it unsupported. In wind, a single cane is enough insurance.

Is the red colour stable?

Yes. Garden Wonder holds its vivid crimson from first flower to last. It doesn't fade, streak or shift tone through the season. That consistency is one of the reasons exhibitors favour it. If you want a red dahlia you can rely on to look the same in October as it did in July, this is the one.

What's the difference between Garden Wonder and a dark dahlia like Dark Spirit?

Dark Spirit is a deep burgundy-black, velvety and moody. Garden Wonder is a clean, bright crimson, vivid and forward. They're on opposite sides of the red spectrum. Planted together, the contrast is excellent: Garden Wonder provides the brightness, Dark Spirit the depth.