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Semi-Cactus Dahlia | Fiery Flame-Toned Blooms
Dahlia 'Vulcan' is a spectacular semi-cactus dahlia that brings pure energy and drama to the summer garden. Its bold, beautifully sculpted blooms feature fiery shades of glowing scarlet-red, warm orange, golden yellow, and creamy highlights — creating the look of flickering flames in full bloom.
Its elegantly pointed, partially rolled petals give it that classic cactus-style texture, while the vibrant bicolour blooms make it an absolute standout in garden borders, cutting gardens, and statement floral arrangements. A prolific flowering variety that delivers colour and impact all season long.
Clump Count: 1 Dahlia Clump
Plant Height: 100—120cm
Plant Type: Tender perennial
Light Requirement: Full Sun
Blooms: Summer through to first frost
Plant Spacing: 45—60cm
Plant Staking: Recommended, especially in windy areas
Our dahlias are supplied as 1 healthy dahlia clump, ready for planting once conditions are ideal. If planting is delayed, keep your clump in a cool, dry, dark, well-ventilated space until ready to plant.
Dahlias thrive beautifully across South Africa when planted in spring, once all danger of frost has passed and soil temperatures have warmed to approximately 15°C or above. In most South African regions, this is typically from September to November, depending on your local climate.
Choose a sunny, sheltered position with at least 6—8 hours of direct sunlight daily. Dahlias perform best in fertile, well-draining soil enriched with generous compost and organic matter.
Prepare your planting area by loosening the soil to approximately 30cm deep, incorporating compost and a balanced granular fertiliser before planting.
Plant your dahlia clump with the growing points facing upwards, approximately 8—10cm below soil level. Firm the soil gently around the clump to remove air pockets and water thoroughly after planting.
For containers, choose a generously sized pot with excellent drainage and a premium-quality potting mix.
Watering:
Avoid excessive watering immediately after planting, as dormant clumps can rot in overly wet soil. Water thoroughly once after planting, then wait until active growth appears before watering regularly.
Once established, water deeply once or twice weekly, increasing frequency during hot weather or in sandy soils.
Feeding:
Dahlias are hungry growers and perform best with regular feeding. Apply a liquid or water-soluble fertiliser every 2—3 weeks during active growth to encourage strong flowering and healthy clump development.
Reduce feeding toward late autumn to encourage proper dormancy.
Staking:
Recommended, particularly in windy positions, as the tall stems and large blooms benefit from additional support.
Deadheading:
Remove spent blooms regularly by cutting just above a leaf node to encourage continuous flowering throughout the season.
Cut Flowers:
An exceptional cut flower variety with strong stems and dramatic colouring — ideal for bold summer arrangements. The more you cut, the more it flowers.
Overwintering in South Africa:
In many milder South African regions, dahlia clumps can remain in the ground over winter provided drainage is excellent. In colder frost-prone regions, lift and store once the foliage naturally dies back.
With its blazing sunset tones and beautifully sculpted semi-cactus blooms, Dahlia 'Vulcan' is a true showpiece variety for gardeners who love bold colour and dramatic floral displays.
