Red Cap Dahlia Tubers

• Variety: Red Cap
• Type: Decorative
• Colour: Red
• Flower size: 10cm across
• Height: 100cm
• Spread: 60cm
• Flowering: July to November
• Cutting: Yes
• 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

Red Cap: A Straightforward Red Dahlia That Does Its Job Well

Sometimes you just want a red dahlia. Red Cap is a decorative type with 10cm flowers in a clean, no-nonsense red. No two-tone gradients, no colour shifts, no unusual petal forms. Just red flowers on strong stems above green foliage, from July to November.

At 100cm with a 60cm spread, it's a reliable mid-border plant. The practical selling point is consistency: every flower is the same red, which makes it easier to plan a scheme around than varieties where the colour shifts between blooms.

Red Cap in a Scheme

Red is the universal warm accent. Plant Red Cap alongside Golden Sceptre (yellow ball, 90cm) for a classic red-and-gold combination. White Swan (white, 120cm behind) provides clean contrast. For a hot border, combine with Rip City (deep red semi-cactus, 120cm) and Brown Sugar (paprika ball, 90cm).

Why buy from Ashridge?

Our dahlia tubers are Dutch first-class quality, imported direct and hand-graded by us. We look for and reject 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, Which? Best Plant Supplier, and human support from the team in Somerset. Browse the complete dahlia collection.

Frequently Asked Questions

Is Red Cap good for cutting?

The 10cm flowers are a practical size for arrangements and the consistent red colour means you know what you're getting. Cut only fully open blooms.

Will Red Cap grow in a pot?

At 100cm it's borderline. A large pot with staking will work. Our container guide covers the options.

Does Red Cap need staking?

At 100cm, a light support is sensible. Full growing advice in our dahlia growing guide.