‘Black Jack’ is the ultimate statement dahlia — dark, daring, and irresistibly bold. His large, velvety blooms are a deep wine-red to near-black, glowing with subtle undertones of mahogany and garnet when they catch the light. Elegant yet intense, he brings a sense of mystery and luxury to the garden, pairing beautifully with softer tones for striking contrast. With his strong stems, lush foliage, and powerful presence, Black Jack is the garden’s high-roller — moody, magnetic, and impossible to ignore.
Dahlia Black Jack
Variety- Large cactus
Height - 100–120 cm
Spread - 45-60 cm
Size of flower - 12–20cm
Position - Full Sun
Growing Advice:
You can pot up your dahlia tubers indoors in March or April to give them a head start, or plant them straight into the garden once the risk of frost has passed. Either way, you’ll be rewarded with strong, healthy plants and a summer full of spectacular flowers.
And don’t forget, with every dahlia tuber purchase, you’ll get FREE access to our ‘Introduction to Growing Dahlias’ online video course (usually £49.95!) It’s packed with expert tips and insider know-how from Andie, everything you need to grow confidently and get the most from your dahlia tubers.